When installing a heavier than stock pressure plate, it is highly recommended to look into an upgrade clutch fork. OEM is a known weak point. Stronger pressure plates equate to higher torque holding ability.
Check out the thread here:
http://www.ft86club.com/forums/showthread.php?t=104963
Post #64, #95, and #105 are some 3rd party testimonials.
Thanks,
Eric