I hate that cam but that's what you have so here is what I would try.
Your idle circuit is probably a little lean causing a lean transition when you open the throttle. I would fatten up the idle to 12:1 engine at idle in N fully warmed up and see if this helps. A 35 nozzle in the Sec is already large and not curing the transition as the Sec opens.
Drop from 85 to 83 or 84 and see if that leans the WOT AFR.