jetng or something else?

[SLOPOKE21]

i have an 03 with dmc pipes timimg advanced milled head k&n pods reed spacers stock carbs. its got 320 jets in it and when i run 6th gear out all the way it starts to cut out and doesnt pull anymore. i tried smaller jets to lean it out but it didnt help. i ride at about 1500-1700 altitude. could my carbs be running out of fuel faster than it flows from the tank? i dont know what else to do