I've got a 2004 521 & 2004 250xs that has never been propped correctly since I bought it. The stock ranger prop was / is a 27 Tempest Plus. I bought a new one last summer and reached 69MPH at only 5200 RPM. I remember a few years ago over-reving a new 26 Fury and getting less speed out of a 27 Fury than a banged up 27 Tempest Plus. I suspect that a 26 Tempest Plus may be the prop, yet I hate to buy another new prop thinking I've found the right one, again. Would a four blade be better? Has anyone dialed this combination in for speed and or 4' rollers? Any advice would be greatly appreciated - Thx Guys...