Hey Sarge,
If you have a forged bottom?, life begins at a 150 shot, so why not start living. I currently run the NXL 180 direct port on a stock bottom end and I've gone bottle after bottle for the last six months with no problem.
Don't get me wrong, it will eventually give but when I forge my bottom end I imagine it will last for at least three years if I stick with the 180 shot.