Sounds like you're having fun as I did during my week-long balancer fiasco. I got the wrong part 3 times. The fourth was finally right. If you have any shake at idle it is the wrong part. And I know the "out-of-balance" feeling you are explaining. I knew right away that something was wrong. It ran OK for the block that I drove with the wrong part on, but I did not drive it past 30mph because I was afraid of damaging something.
I'm shocked a dealer told you the same balancer fits all 92-95 H-bodies.
There are major differences from even the 94 and 95 balancer (not to mention NA vs SC cars). I compared when I did mine. Nothing has to be balanced on a new HB, the differences are there for a reason and fit specific year and model cars.