
Deano,
I use a Aldila NV 65 in my TM 540 and it is a superb combo. Bearing in mind your tempo though I would look at a heavier shaft and my suggestions, based on cost are as follows:
High end : Aldila NV 75 (stiff and NOT the 65)
Medium cost : Harmon GX (stiff GXS) or Grafalloy blue ( reg flex - tip trimmed 1/2 inch)
Low cost : Penley Stealth 70
Steel: Rifle 6.0
All of the graphite shafts are 70-80 grams which will help with your tempo and stop you from overswinging. I would strongly suggest that you stay in that weight range and avoid the 60-70 gram range.
The Harmon GXS is a sweet shaft and represents superb value for money and would be the best in terms of value for money. I just reshafted my 3 wood with the GXS and it really is superb. The NV is the best of the bunch, hands down - but it is expensive.
Oh, bear in mind that the TM 500 series takes a 0.350 tip diameter. If you buy a shaft with a 0.350 then that would be better otherwise you can buy one with a 0.335 tip and use a shim.
Hope this helps.