Just thoughts on carb model direction

2005 450

Mods
full Dr D exhaust
Custom BBintake
14.1 piston
Cam mod
Vortex cdi
So I'm looking to get a little more out of it. Never been on the rollers but want to keep it as reliable as it's been if possible. These mods other than the vortex have been on it since 2007ish and it's been super reliable as a trail/drag quad.

With me running a 14.1 should I drop down to 12.1 and go 478 or just port head and do camshaft and leave it alone? I looked and couldn't really find anyone with my similar setup that has upgraded.