going with my new bottom end with a b18a1 block
b16 head with a full gsr valvetrain
itr crank
itr rods
ls pistons
itr oil pump
gsr water pump
arp headstuds

before i was running a stock ls bottom with arp headstuds and acl bearings putting 315whp on 10psi

my question is because the shorter stroke of the itr crank ill go from a 9.96 compression too a 9.71
on 10psi before i got a 16.74 comp on boost
wanting too gain a lil bit of hp but not go over 340/350whp

can i change my waste spring too a 13psi and be safe around my goals?
my comp on boost would be 18.30 is that safe on 93 octane??

thanks!