Found a little bit about the Ebonite NVS ball you have. Guess it was available in the 2006-7 time frame. Not that long ago and it's reactive resin, too. It appeared to be a pretty darn good ball back in the day. You sound like you should stop by the pro shop and get the inserts. Perhaps you should consider getting your fit checked, too.
When I came back to the game, I tried using my Brunswick LT48. It felt pretty good, but the finger inserts needed replacing at least and I was throwing a full-roller.
Following my visit to the pro shop I had a new reactive ball and drilled so that it would work well with a 3/4 roller or semi-roller I guess. Never threw the full-roller again. My hook came back and was bowling around 165 or so to start after 30 years... Since then I've improved quite a bit and feel comfortable on these new fangled synthetic lanes using the reactive balls. The grip I have on my ball now has the thumb hole angled forward rather than the reverse hole it had on my old stuff. Also, the finger holes are now reverse angled as my fingers were getting pretty stiff after bowling several games.
Rolled my first 700 series just this last week with the last game a 280 in our senior league. I suppose all the folks in our league think I should be bowling with the PBA50 guys or something...

Good luck...
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