Had trouble hitting circular moves with the zippys.
Here's a tip for those using Zippyy's for mainly fighters;
Remove the green restrictor plate, instead of just leaving at the square 8-way position. It's smoother and the corners are much less pronounced. Should make those circular moves easier to pull off. It's also good advice for classic games players who don't prefer square restriction with 8-way operation.
Tweaking the switch levers a bit to make them a little more sensitive can help as well. The standard lever position when shipped is meant to allow for proper operation with both 4 and 8-way setting of the restrictor plate. If you are configuring them as 8-way, there's no need to worry about the effects of the switch lever tweaks on 4-way operation.