i have noticed the "a bit left" from a cold bbl start also,
with several lubes and temps,i was getting a little left, sometimes high [usually] and sometimes a bit low the little low were always much closer to the group and were usually same day shots.
the lowered load dropping into the group on the first shot is proving that bore condition is the real culprit here,and is also proving out why the MML lube works in the cold on the first shot.
it's what lead me to start using atf in my lubes as a bore conditioner. [hoping it would hang out in the bore keeping everything in a more consistent state]