Yeah, I wouldn't give up on the bike already.
Part of improving as a rider is to figure out a way to work WITH the bike by sometimes modifying your own riding. But I think you still have a lot of tuning and setup to cover before you start modifying your own riding style.
Since you are heavier, it's a given that you will have to use your weight to your advantage on corner entry and maintaining higher midcorner speed especially, because those are the only two times you can capitalize on your weight. Work on your roll on because it will virtually have to be perfect; just on the threshold to use all the drive grip you can get to minimize the time you are losing out of corners and on the straights. The crossplane configuration of the Yamaha allow it to serve up the best corner exit, so focus on sticking with the top Kawasakis on this aspect more than the Yamaha.
Good luck man, really hoping you get a breakthrough; gradual or sudden, it's all good.