850 Ultra XP lean bogs when secondaries open

I run 37/39 nozzles 50cc pumps, blue cams primary #2, secondary #1 hole on my stock stroke 340. This tune gives me the best 60' time with progressive linkage and .020 t-slot, 6 psi fuel pressure, 1/2 site glass up front, slightly above 1/2 secondary bowl. I also make it a habit of purging any air prior to the first pass of the day.
Good info! For the OP, what intake are you trying to fuel? And maybe my big ole Super Victor could use more shooter size!!