plug chops only get you so far really. if the plugs are rich and oily and at wot throttle it struggles to build rpms. drop a main and make another run. still struggles and the plugs are black drop the main again until it pulls clean. then work on your needle and midrange. dont change a bunch of stuff at once. get your WOT crisp and work down from there.
You are on the right track just listen to what the engine wants.
edit: just saw your latest post, try going WOT low in the rpms and make it drag itself onto the pipe. if it spits or burbles, your rich.