You don't mention what size Kevlar chute protector you use.
12 inch is usually recommended, but 18 is what does the job. Your chute should be totally wrapped by the burrito leaving nothing exposed to hot gases. If 18 won't cover the chute because it's too large then up size till one does or learn better folding technique .
L-3 Tripoli 9693 Tap
ICBM Orangeburg SC
QCRS Princeton ILL
MDRA Price Maryland
Woosh Bong Wisconsin
"Made" member of Chicago Rocket Mafia
Rocketry...........an exact science.......but not exactly !!!