OK, took 50% off the hammer spring cap and one coil off the spring, took the Xcal to the range and put 200 rds thru it. Accuracy, reliability and chrono testing. After about 50 to shake it down a little put it on a rest. 15 yds sub 1" group, 25 yds 2" groups. Had one stovepipe in the first 50, no other issues, lit every primer (Winchesters). The load for my CZ S2 is an Acme 145 gr molycoated round nose over 3.0 gr TiteGroup at 1.125 OAL, made 136.3 PF. My only issue is the front sight blade is too wide, or the rear notch is too narrow (for me). Ordered a .095 f/o from Dawson Precision (stock is .120 ish).
Oh also DA is right at 6, SA just under 2. Think this gun could be a winner.