Gonna try blocking 3 set of the emulsion bleeds and see what effect it has - will leave the 29s in #1 and #3 and block #2 and #5 (#4 already blocked).
From other searches it seems like jmarkaudio (he seems to have good standing in the robust community that favors emulsion bleed tuning) recommends it:
Anyone found a good tune for Holley Ultra HP 850? • Speed Talk
"Excessive emulsion is a large part of the issue, the Ultra 850 is fine otherwise. .026 main air bleeds, put .026 emulsion bleeds in the top and 4th emulsion, plug the rest. Move the idle feed shown in the link below, try either a .035 or .036 idle jet. 92 square jets to start with PV's plugged with non oxygenated fuel. Jet as needed for best performance for the engine needs and fuel characteristics. If you need a PV for the street, put one in the primary only, jet the primary down 5 to start, repeat jet the primary as needed. Use a 6.5 PV minimum."
Seems he knows more about this than I do...
Since I am generally satisfied with the primary side performance, gonna start with the secondaries. Sound reasonable?