I have flown mine(well, it was a 'hand me down' kind of rocket from some crazy dude that always likes having these wild, crazy drag races and..but, that's beside the point) numerous times all single deploy and it really rips on a G71!
I swapped out the motor tube supplied with the kit for a motor tube long enough to accommodate the length of the root edge of the stock fins and the two centering rings. I slotted the tube and mounted the fins through the wall.
Although I've never had a problem with the nylon shock cord mounts LOC supplies with their kits, I used braided kevlar attached to the motor tube instead.