From my experience, it would depend on the shaft...which one are you testing? 

i was looking at a whiteboard, rombax z or rip.  something low spin.

Whiteboard is the lowest spinning shaft I know combined with an 8.5 head in in a -.75 loft position.  Pretty rare in my book to tip either of the shafts unless ballspeed is above 170mph. There may be a regional fitter with the the original whiteboard available.  Many of my players have switched to the Ahina or the Titleist Ahina.  Many players have the Titleist Ahina 72 X tipped 1" to play like the unbranded version. 

Ballspeed definatley not above 170, it was 158-160 yesterday on the LM, SS was 107 to 110, high of 111. I currently play a 73x WB and like it, but I just noticed that I pick up 2 ro 3 mph in swing speed when I swing an S flex

Very nice!  Well, assuming you maintain control, I like ordering things I've tested like the stiff version.  Projecting shafts based on tipping and torque, etc...not my idea of a good fitting experience.