Well its been awhile with the pipes on and it was worth the effort imo .
It actually pulls hard now from 5000rpm and actually gets to redline or beyond easily , those smaller diameter pipes like I guessed were really choking it off ..
Just received some new 812 pistons kit last week , I have a spare set of barrels so I'll get those rebored and get ready for a swap over soon-ish(after I get tooth fixed in gob ).