I've been stringing my Head Extreme MP with RPM Blast 17 in the mains and TechniFibre X1 BiPhase 17 in the crosses. Tension 52/57. All-court player with an emphasis on serve and volley, live by my getting in a hard kick serve for my 2nd serve... Really need something to pocket/bite. Things I liked with RPM/X1 before it went dead: Excellent feel, best ball-pocketing of any string I've used -- could swing as hard as I wanted with groundstrokes and watch it just jump down at the baseline unlike nothing else I've tried. Things I hated: It was dead/board-like after about 2-3 matches. At nearly $20 for string alone, that's way too quick to go dead. Even if it was $5 a stringing, 2 matches is way too short . I've tried MSV Hex / Goshen 17 at 50/54 and it was really good, yet I was hitting long. I tightened it up 5 lbs and it felt like a board yet I was not longer hitting long. Seems MSV Hex really doesn't want to be much above 50-52... I have thought about keeping MSV at something low 48-50 and while the synGut or MF crosses are up in the upper 50s, but it seems wrong to have such a large difference in tensions between mains and crosses. Tried MSV Hex / Sweet 17 -- and it was horrible @ 50/54. The Goshen cross had a much crisper, more lively feel. So... Any suggestions for longer lasting string combinations and/or tensions that would rival the initial playability, ball-pocketing, touch of RPM/X1? Many thanks in advance.