Not sure how it is with Profile since they actually have a BMX-style crank for MTB, but I had a tough time finding a spindle with the right diameter and length for an FSA BMX crank that I adapted for a Schwinn Panther.
Out of curiosity, what pedals do you use and what cranks have you tried? Also, what grease or anti-seize have you used on your pedals? I hate to see such a heavy crank on a Homegrown but stripped cranks are no fun.