lolminraise, have you tried doing a hybrid with the RPM blast and a multi? I've been playing the RPM Full and recently switched to a RPM(main)/N.Vy(crosses) and can feel a difference in my arm. I actually LOVE my string combo now. Ball comes off with more pop and spin than it did before. I was a constant string breaker(mains dead center every week or 2). Tried the black widows and popped those faster as a full bed bc they sawed through each other quickly.
By going Hybrid you'll save a few bucks too. With the RPM at $17 and the N.Vy at $7, you're looking at $12 per racket.