I saw this post but never after the original report. I did not know people were using 8mm shafts, that is all I've ever used. I have not used the Abellan shaft yet, only custom made Rob Allen 7.5x1500 single flopper with pins all the way back (same as Abellans). I have been shooting it with 16mmx350 bands and 3/64 stainless steel cable. It has shot really hard at the current setup. I have had one 7.5mm shaft before and really liked it. You could tell it has the speed of a smaller shaft but still plenty power. I don't know if I would go back to 8mm after shooting this Rob Allen 7.5, its is very stiff and I'm not shooting huge fish like that report (until I go to Mexico in July maybe
I also bought a 7.5mm abellan threaded shaft and put a Ultimate Slip-tip on it for cobia and small tuna which I will try this weekend. I'm trying to keep it very fast so it hits where I aim. The speed is what I have enjoyed most since getting the gun.