The two major differences is the rocker size and toepick cut. The Ace toepicks are cross cut, the Comets are straight cut. Cross cut is supposed to give you more grip on the ice. When I got my Aces, they did feel more grippy, but since the toepick was also much bigger than on my other blades, I can't say whether it was the bigger size or the cross cut picks that made them grippier.
Aces have a 7' rocker, Comets have a 8.5' rocker, which is a huge difference. Most upper level freestyle blades are 8'. Some people hate Comets and some people love them. Going from a 7' rocker to an 8.5' rocker will require a long adjustment period.
Check blade alignment, sharpening & boot size first. (Too long boots can make it impossible to reach the pick for anything.)
(By the way, I thought you were supposed to three turn into spins, not spin off the toepick. Could anyone else clear this up for me?)