same kumho problem... balancing & egg shape. 245/45/18 100Y XL
I've always used kumho because the price well reflects in proformance if only they didn't need constant rebalencing.
I've had 4 duff pairs, ku31 x 2 pair, ku 39 x 2 pair that had to come off in the end they were so bad.
No amount of balencing can sort an egg shape tyre.
These new ps71 are very soft, squishy, feel like running on 20psi with 30g wheel wobble even after twice rebalencing them & 1 of them is egg shape.
I am worn out with trying to get them right & think after years of kumho on various different cars I'm giving up on them.
Changing to Dunlop.
I always feel bad going back to the shop to moan they must think it's me lol but kumho have let themselves down & I will say so.
PS71 is more expensive, lower spec & lower quality, not for me, I like a tyre to be not thought about coz it's getting on with it's job instead of feeling there's a 60mph side wind blowing me around & the steering wheel hammering out of ny hands not to mention the amount spent on rebalencing & hanging around tyre shop waiting for my turn.

And the same Kumho problems with Me.. balancing & egg shape. 215/45/17 91Y XL
I've often used Kumho Ecsta PS31 ,because have a chance to do it and they didn't need constant rebalencing.
These Kumho Ecsta PS71 are something different.
You will get "massage" , "constant lane change warning function" and sunshade vibrations for free.
Avoid buying them!

Very very good tired. Higly recomanded.

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They were very grippy tyres that wore evenly. I wouldn’t buy again because the rear left was finished after 9,000 miles.

When I bought a car the previous owner had put Kumho PS71 on. I was sceptical at first but they are pretty sticky and suit the car pretty well. Pretty predictable. Never stepped out on me unexpectedly. Solid turn in response. No unexpected understeer. Wet performance was surprisingly good, never had any moments. Relatively loud, but nothing terrible. Have bought again.

I drove with this tyres in a combination of road. First on the highway (about 10.000 km) and then in the city and and the surroundings (about 7.000 km). Wear was a little higher on the highway, about 15%, compared to mixed driving.
After 17-18.000 km the tyres have about 5.5-6.2 mm remaining, from 8.5 mm as they had at purchase, which is ok for a UHP tire and the quality in road.

I had no problems with them in terms of balance, even when you can switch between them (face with back after 10.000 km).

I am not the most sporty driver but I do not drive like an old man :D , so for my needs they are excellent, never gave me emotions.

The only complaint is that they are a bit noisy for my taste, especially when they are cold. If they did not have this minus, I would not have considered another tire.

Finally;

They are absolut great for those people who not drive in the rally race, or those who pushing to the limit their car, but with the minus about the noise, could be a litter better.

Purchased these Kumho’s to try something different, I usual use Conti, Dunlop or Bridgestone.

I found them average in the dry but shocking in the wet. They did not like any patches of water and pulled the car into water spots but then in the dry they felt like any other tyre driving normal but did not take long to reach the limits when driving hard.

I will be going back to my normal choice next time.

Amazing tires, they work really well. Highly recommended

Very very good tired. Higly recomanded.

Best tyre for that price! Love it

Excellent tyres. Cannot fault in the wet or dry. Will be buying again after my first 8 tyres wear out (on separate high power 2 cars).

Not the most comfortable tyre but then again I run high tyre pressures, the price/cost is excellent and noise levels are perfectly fine to me.

Car is nigh on 380 bhp in power and very close to 553 lb/ft torque and these tyres are great for the price.

So far lived up to what I was hoping for. On my 2017 GT Mustang automatic I always had trouble with the Pirelli P Zero on the rears hooking up with the road under power , even at 80 km/h hitting the pedal to the metal. Also always broke traction with a light part acceleration. The Kumho PS 71 had not yet broke traction under full pedal to the metal at 60 and 80 km/h , even in sports mode. They also launch well with a slight push where the pirellis spun up. Pirellis were only good on hot days where the Kumho PS71 grip at cold nights already off the mark. Don’t know how long they will last , They seem quiet to me. I run 32 psi cold before driving. Pirellis only lasted 17,000 km on the rears,

Cheap and reliable the most important things is it last far longer than my stock 225/45/19 Continental Sport Contact 6 tyres. The Continental Sport Contact 6 lasted me only 15,000 miles, while my Kumho Ecsta PS71 still have 60% left after 17,000 miles. Great responsive handling and reliable during raining days. The only setback of this Kumho Ecsta PS71 have compared to Continental Sport Contact 6 is the noise level. But for the price and performance of this tyre is definitely a good buy. First time trying Kumho tyres and it had really build up my trust in this korea made tyre.