If you are going to use braid (for its sensetivity), then you really need to use a softer rod and/or back off the drag. The superlines have no stretch, thus no shock strength. You can't whack 'em as hard as with monofil, because something's got to give. Usually, it's the knot, as you've found out. You have choices, so pick one or two, and catch fish. I'd use the Palomar knot, and back off the drag, #1. Next, I'd back off the rod power. I'm not a big fan of any of the Superlines, but trying some here and there. I see no need for it on baitcasters. Holding the line ahead of the reel is a good way to increase sensetivity without using braid, and without investing a fortune in expensive rods.

Here is a spin to the polimar knot when using braid. When tying the polimar knot,just when  you are making the overhand Granny knot with the loop, run the same loop another twist again, and then bring the hook thru the open end. Be sure to wet the line when tightening, but it works great. Give it a try.