The leaner needle will solve this problem but this is because it lets less fuel until you reach the main circuit which is good to solve the bog problem when you floor it but what if you say your "moderately" accelerating and using the mid slide position (critical needle taper area) will your engine be running lean since you put a leaner needle in? Need a WBO2 in this case really and do some road tests.

Speaking of mains I'm running 235 (yes thats a 2.35mm hole) IDK why is so big but that's what runs good - at WOT and the car pulls darn good (my wide band proves this - best $350 I spent). It maybe an excessive size and maybe the needlejet/jetneedle combo is still acting like the restricting function at WOT and regulates the fuel? IDK, car runs good though.