The only thing on the carb you're supposed to mess with when it's cold is the choke... any other tuning you do when it's fully warmed up. As long as it isn't so bad that it stalls out, the way it runs when cold shouldn't really matter. My carb (750 Street Demon) has somewhat sluggish response and sometimes hesitates until the engine is fully warmed up then it feels almost as responsive as EFI. Before the SD I had a 625 cfm Carter AFB on my old 360, when I used my wideband to tune that for a leaner cruise (I took it from 13.5:1 to 15.5-16:1 at cruise) it ran kinda crappy when cold.
Lean the primary circuit back out and move the accelerator pump linkage to the hole closer to the carb body, there should be 3 positions.
