I actually drilled and tapped the riser on my Nitrum to accept a low/rear stab and weight. I wanted it there that bad.
The bow originally felt like it was front heavy. It's hard to explain, but I felt like it just needed more weight under my grip...specifically towards the rear.
After I put on the back stab, it's like a night and day difference. It may or may not have helped me shoot better, but the bow just 'feels right' now.