Natalia, it's funny, 6 performances in total, we each saw 3 of them. You were right about Vishneva's "silly dance" in Act 2
I went to see Sat matinee (Kondaurova & Ivanchenko), Sat evening (Vishneva & Matvienko), and Sun evening (Lopatkina & Korsuntsev).
In a sense, I believe the size of the stage did directly affect the performances. Timofeev, due to the little "stumble" at the end of his Golden Idol solo on Sat evening, held back quite a bit on Sun evening to allow space and maintain his balance with his final jump. Korsuntsev slowed down at the end of his solo, both in Act 2 & 3, for the same purpose. With the scenery, the extras, all the dancers on stage, the place was "stuffed" with very little extra room left. If they have gone full force, they might have gone off the stage easily.
If I "have" to compare all three Nikiyas, I found Vishneva's interpretation extremely moving, especially in Act 2. I couldn't help but felt so sad for her. I won't go any further with the comparison. That was the first time I saw Kondaurova, Ivanchenko, Vishneva, both A and D Matvienko, Lopatkina, and Korsuntsev live on stage, so I was happy.