My oil burning pig. Pics too!

I think the issue with your jetting is when you're running a power valve you need to jet down a certain number (6-8 usually, depends on how big the PVCR is) on that side because the power valve increases the A/F ratio by that amount when it's working. So in effect when you're at WOT or at least enough to open the PV the primaries are dumping fuel as if you have #86 jets in there, and if your secondaries don't have a PV then they are running much leaner in comparison which will obviously screw up the distribution between cylinders.