i've got almost the same setup just with a bullet pipe and the stock airbox, and i struggled with the same thing.
here's my advice, ditch the high flow filter. it makes jetting inconsistent. i had that filter on mine, and stepping back down to the stock airbox made life a lot easier. stock bing carbs like the stock airbox.
also, i think you're jetted too rich. i'm at a 62 jet in 30 degree weather with a performance pipe. ghost rider amy is also running the same setup and was down to a 58 during the summer and was thinking about going to a 56.
get a performance pipe! kits with stock pipes are total snoozeville. i'd recommend the techno circuit. these 50 tccd kits have shitty bottom end already, get a pipe that will help.