I thought I had my carbs dialed in perfectly but when starting on a slightly cold day I have a heck of a time getting it started plus the carbs pop for some time until the engine warms. Should I try fattening up each barrel a bit? I'm asking BC it runs so good at operating temp which is where I adjusted it.

you need to borrow a wide band AF meter to answer your question.
its all guess work otherwise....
they could be fine in at one rpm range and off in another.

Webers are notoriously cold blooded on our engines.. Poor running when cold is usually just a side effect of having them without a choke..

If it runs great when warm, then I wouldn't worry about how it runs when warming up...

Its more of just the difficulty in starting. I may try to fatten up each just a hair to see if it improves starting then go from there. I know my neighbors were hating me this morning