also, is there a way to gain control over a powerful racquet through tension and/or lead tape?
Sort of. I consider tension and lead adjustments as useful ways to tune an already good foundation. Raising string tension will make a stringbed less springy or spongey. This added 'crispness' can give a stringbed much better feel and control, but if you go overboard, it will feel harsh like a brick-on-a-stick.
Lead will change the balance and stability of a frame, depending on where you place it, but I don't think of using it to reign in the power of a racquet. More weight in a frame brings more inertia to the collision with the ball and effectively makes the racquet more powerful, unless you put so much lead on the hoop that you can only swing it slowly. D'oh! I only use lead to adjust the balance in a racquet so that it handles predictably for me.
Now that I'm playing more singles, I need to rally more effectively from the baseline, but I still go to net to end many points. I found it a lot easier to hit groundstrokes with a more flexible frame and I've had good success with a Volkl C-10 Pro. Many newer racquets are light, stiff, and powerful, so it's no surprise to me that you found a little more of a comfort zone with the O3 tour; it has a flex rating in the low 60's and it sounds like the more flexible frames will be a better fit for your game. Two Prince frames that are less powerful than the Diablo XP are the Tour Diablo and the NXG (both in midplus), but there are others including the Fischer M Speed Pro#1.
Good luck with the search and welcome back!
