Hey Mazaev, it was cool seeing you on the ride! I had knee pain as well. Posted about it, thread topic is well..knee pain!
I lowered my seat before my ride on saturday, only 21 miles, but i was hungover so it seemed like a lot more! knee pain was significantly reduced. Im theorizing that with all the uphill grinds and dh spinning, as well as all the seated locked in pedaling, a slightly lower seat height will ease the pressure on all the joints. Adds some "wiggle room". I only lowered it about 2mm.
Going for a ride now curious to see how it feels.
Mark