Brendan,
You could consider modding the ol' PST to a say 80mm...will give fantastic views - better than any SM40/SM60 or Lunt.
I have a double stacked SM60 and if you work carefully with the tuning, it does everything that needs to be done...I've never see or used the "pressure" tuning so can't comment. Tilt tuning seems to work 100% for me.
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