I realized wow.
In reviews in germany the wow and flutter of the RP3 was measured nearly twice as much as with the debut 3.
Assuming the test mesurements where correct, a change to a rega will make things probably worse instead of better, in your sense.
Nevertheless, the test result was excellent in total. I wonder how reviewers can come to such a result, as nearly 0,15 % wow and flutter are a lot for a turntable at this price point.
If you are sensitive for wow and flutter, better keep your debut. Or perhaps get a vintage quartz-controlled direct drive model. Those drives usually dont have any audible wow and flutter.
But first of all, check if your pulley and drive belt are clean. Maybe there are residues (grease, cigarette smoke etc.) causing the problem. Clean belt and pulley with isopropyl-alcohohol and some q-tips. Check if the belt is mounted the right way. It has a "pro-ject"-print on it, this must face to the outside and not upside down.
I have a debut 3 in use, too, and never heard any wow or flutter.
Good luck, kalypso