Best Tires for the BMW M760i xDrive

The stock runflat Pirelli P0 PZ4 came with G12 M760i is nothing about comfort or performance. I went for 4 PS4S without * as there's no BMW spec PS4S with 245/40/R20 size (front, actually 275/35/R20 PS4S * is for F90 M5 front).
Pros
1. Compatible with xDrive on G12 M760i (probably also good with other AWD G12 7er models): No noise or abnormaly with the central clutchpack diff.
2. Comfy: non-runflat. Soft and cushioning. PS4S makes M760i a real 7er
3. Performance: Better 0-60. Better grip all time (not for winter). More confidence with the weight and torque, though just a little bit, after you get used to it, as the suspension might be optimized with runflats (the suspension seems too soft with non-runflats).

Cons:
1. Poor handling: The suspension is too soft with non-runflats. I know it's not fair because it's not the issue with tires. But the feel is not sporty, but kinda Rolls-Royce.

Tire size 245/40 R20 & 275/35 R20 fitting G12 7er
Superior noise control than Sottozero 3 and Michelin X-ice. Amazing comfort, in comparison among whatever runflats or non-runflats. Very good winter tires for limos.
Performance is a bit of disappointing. There’s no magic for winter tires putting down all 590 lb-ft torque on snowy days, even M760i is all-wheel drive, which they are supposed to be. Lateral grip on dry road is pretty good, bringing the confidence and feeling when cornering with summer tires back to winter days. Ice grip is poor while the grip on packed snow is even worse. Wet grip is not quite decent either.
Would definitely repurchase for the comfort a limo just need. But in scope of performance, think twice on the trade-off: snow/ice grip, which are the definitive advantage of winter tires over summer tires, for summer tire-class (P0 PZ4 runflat? Definitely not Michelin PS 4 S class) lateral grip on dry roads.

Conclusion:
Pros: Awesome comfort and noise control; good lateral grip and responsiveness
Cons: Poor ice grip and snow grip.