i use flexfoil handles and think there perfect!
my mate flys a PKD buster and uses there standard handles and they are just not up to it.
if i were you id use the flexi's
i own 3.5m bullet and have only ever encountered the infamous spin when i let go and let the killers do their work, but when i let my mates have a go they seem to have a real problem so im going with funny flying methods causing the spin.