With the HX, I can do a lot more with individual effects. By itself the Simple Pitch works okay, but add some EQ tweaking before and after, maybe some compression and then top it off with an IR and you get a very usable pitch shift patch. I may try blending the IR with dry to see if that works better. It's still mono, but you can get away with fifths and octaves and you won't want to use it for slapping.
If you have time, I would like to see what your patches look like in a PM? I don't slap ever so that works for me! haha I really would like to see if I could get something to work well though.