ok guys, i have been using the PK type C mid and quite happy with it except that after a hard 2-setter, my arm feels sore. if i have to play for the third set, my serves become less powerful and i feel fatigued overall. so i have been looking for a racquet with the same specs but swings lighter and i have narrowed it to these two: Volkl tour 10 V-engine mid -- is it too flexible? i love the stiffer feel of the PK type C eventhough its suppose to have a 60 flex. does this volkl feel stiffer than the 60 mentioned in the TW website? iPrestige mid -- i've read that this is the stiffest prestige mid of all, is this true? how is the "feel" though? the PK type C doesn't feel tinny or hollow. is the iPrestige stiffer than the 60 rating? basically, im looking for the stiffest 93 sq. inch with an 18 main string pattern and a swingweight lower than my PK type C (330 sw). p.s. if some one can compare the yonex ti-70 88 sq. inch with these racquets, i'd be much obliged. thanks!