Posted:it's really just practice. try spinning them slower so they have just enough momentum to go round and work on positioning and where you need to add the extra push to get them straight.
It really will come just with careful practtice. Although I still avoid poi wheree possible after several incidents involving poi and my gentlemans area
A couple of balls short of a full cascade... or maybe a few cards short of a deck... we'll see how this all fans out.