I recently got my 910D3 driver and was fittled with the Ahina 72 X flex shaft. Lovin' the club so far. I'm looking at getting the matching 3 and 5 wood 910F. I noticed that there is no X flex that comes standard, only stiff flex. Will stiff flex be suffice for me as they are shorter clubs, or should I be in a X shaft for them as well?