I would slightly correct this. This EZ98 is arguably the most
precise power frame, but not necessarily the most controlled overall. It still has a very
hot string bed and that injects a lot of immediate energy at contact, and if the player isn't closing the face properly and/or imparting enough swipe, it can and will get launch-y, more often than most of the more boxy, classically-designed frames (Super G included). So, while still a great frame obviously, the EZ tends be a bit more compatible with newer-school, swipey-er, more next-gen mechanics, and less so the older more classically flatter-hitting type, which is potentially more of where
@Asquared is coming from. Could he alter his technique enough to suit the frame? Maybe. But then you kind of get into the debate of "efficient vs. effective" – would doing so actually amount to anything he cares about (more winning, or more anything else)? If his spidey sense is already mixed now, I'm not sure the answer would ever be "Yes". But who knows. I've been plenty wrong before.
As for the inclination to return to more of a flatter-hitting "pleener" style frame, that's more in-line with my original suggestions, and I think it will ultimately be the place to give him the best middle ground on all qualities. Playing devil's advocate again, will
that be the best move for the most winning tennis? Not sure there, either, but these kinds of frames will probably be a more natural fit right away, and that often leads to at least more consistent tennis, which, often leads to more winning tennis, which can make the decision right there, if indeed winning more is the main goal.