1st and 2nd rev through without an issue. If I hold 2nd gear in for a long period of time(at high revs) it seems like it might want to buck, but i dont ever want to hold the engine at that rpm for that long to create the issue

At this point your suggestion of more gas going out than coming in would be correct. so where does that point me. The discussion I had with several people today points me to two places. Either #1- the fuel pump also has junk lodged in it, or #2 the carb rebuild was messed up in someway shape or form. whether that means that they used the wrong kit, idk.