I was taking a doubles lesson last night, and while on break, I complained to the pro that no matter how hard I try, I'm not getting the "whip" I want on my 2HBH. We'd been though this before, with me making several improvements: pushing through with the left hand, getting a better shoulder turn, widening my stance. In the end, though, it hasn't had the kind of velocity that you would expect from a 6'4", 240 lb player. Plenty of spin, but no putaway potential. He said that I should give the 1HBH another try, but I told him my 2HBH return of serve would be really tough to give up. He said I should keep two hands when I return serve, and use one for everything else. Has anybody here done this? This guy has been teaching a long time (after a short pro career), and I trust his judgement, but it seems a little odd. For what it's worth, I like my 1HBH; it's flatter and more penetrating then when I use two hands, but my margin for error is a bit lower. Should I give it a try? For reference, I am a middling 3.5.