My girlfriend jumps a silhouette 170. I've tried it a couple of times at about 1.2 wl. Great beginner canopy! Stable and fun. If PD had made it in 100% 0p it would not have been this big a "secret"..
Well, last december I jumped at -20 C. We spent 2 hours getting the Cessna 182 to start. That was in Norway though...
Another thing: What are the rules about jumping through clouds in USA and other places?