I am looking for feedback from hunters who have actually hunted the animal.
That sweet new Elite you just bought will be fine! I shoot heavy draw bows but that's because I can and not need too. We've had guys and gals with much lighter set-up's do very well. If your KE is 60 or less I'd shoot a fixed head, but I've killed them with large cut mech heads, 75 grain fixed heads and everything in between. Key is to shoot FORWARD, if you're in the "crease" it's a gut shot! Straight up the front leg a third of the way! Quartered away even better!
In my limited experience with Nilgai, most guys whitetail/elk rig would be just fine. I shoot a pretty average set-up, 28" DL at 68lbs with 400ish grain arrows. I honestly think my setup would work for pretty much any animal found in North America. Shot placement is key (and always is) as BPM has stated, but I'm sure your Africa hunts have convinced you of that.
Photos bring it to life- African shot placement !!
Like BPM said- crease=gut shot.