"if the main jets are much bigger than the idle restrictions (they usually are) they will not effect idle-transition circuit."
It might be picking nits, but in my opinion, I feel "not much effect idle-transition" is a more correct statement. I have heard many folks state that main jet or premature PV opening cannot affect the idle or transition but this is not strictly correct, at least based on carb theory (and actual personal experience).
Anything that increases the amount of fuel in the main well can affect the idle well because the rate of fuel flow thru the IFR can be increased. I would agree that this can just be marginal increase but it is an increase to some degree.
