Hey I see what your talking about on JFBB expert trails. The black trails in the center of the mountain where very fun just really short. I didn't try the one all the way to the right side, Those seemed even more advanced but I will give them a try at some point this year. I have to say that Jack Frost's snow held up really good too. It didn't turn into an ice sheet. It seems like their black diamonds (in the center) are a good introduction to slightly steeper hills.
I ended up going on Sunday also...the snow was a little harder than the previous times I had been there but still good. Thunderbolt and Challenge are the two blacks in the center of the mountain, both really fun, I rode challenge quite a bit at the end of the day. Once your comfortable on those, East Mountain will prepare you to ride pretty much anything in the Poconos