Have any .023-.025 welding wire?

Snip a couple pieces put in IFR, bend 90* and lay in channel, see if that helps. If it does, reduce the IFR to about .029-.031 range.

Main jetting likely will not solve this problem. BTDT! In fact after you get the cruise AFR's correct, you'll likely have to step up the PVCR size just a bit.