In my opinion, it's very hard to get a good deep hook with a glove. This is where tabs really shine. The flexibility of a tab allows you to easily hook very deeply, which results in less hand tension and a cleaner release. So, I would consider two possiblities, Ben.
If you were shooting fingertips, try a deep hook with the tab. If you were using a deep hook with a glove, then the clean reless you're experiencing with the tab could be causing the difference. Have you re-tuned your bow since switching to a tab? I think that's a necessity; at least to check the tune if not completely re-tune.