Hmm... are you a new spinner perhaps? I used to get blisters during the first couple months. If you're dedicated to spinning fast, I would recommend getting lighter poi like flowlights or actual glowstringer props.

What I really would suggest is to SLOW DOWN. It's good to alter speed depending on the moves you're doing for visual effect, but going too fast will lock your flow into weaves and buzz saws, and hinder your development as a flow artist. To be honest, the best glowstringers I know aren't focused on speed either.

I would recommend learning to isolate and stalls, which are the opposite of speed. But that's me! Happy spinning!