I don't have an L1 certification or a big enough flying field, so I'll have to stick with the G motors.
Except for the delay being too long, I thought that G80 worked fine. It just had too much velocity when the chute deployed, which no doubt contributed to the Kevlar failure. I think your suggestion of a 4 second delay was spot on. I just couldn't get one to ignite. I didn't know until now that some propellants are easier to light than others.