Well, I just gave it a good test ride with the larger main. Seems to work well.
Just for the record, it's at 42 pilot, stock needle/mid clip, 158 main (sounds rich on paper), AS 1.25 out, woods pipe, power core 2, DF2 reeds, air box lid heavily cut.
Maybe I tiny bit more smooge w/ the 158, but the bike feels really good. I'd say I'll end up with the 158 until temps stay above 70, then use the 155 again.
When I do a slow 3rd gear roll on down the street, the circuits blend very smooth, no da-da-dada-da at all. I assume thats a good sign it's close.