So about a month ago I upgraded my skis from little 64's to 90's that are 160cm long. I love them but it seems like when I am skiing 15 inches or deeper of powder, I noticed one of the skis sometimes like gets caught up and catches in the snow and I go over. This usually happens at slower-moderate speeds. Like I have to lean VERY far back just so my skis can float and not dive in and I crash. When I am in a turning rythm, it doesn't seem to happen nearly as often but in flatter terrain and run-outs, it happens often.
My skis are slightely rockered and I ski in Utah if that helps
(they are Rossignol S7.pro's wich are the mini S7's. They have a 90mm waiste)