Hi Chris. I didn't have much time to get out with it (maybe three times) but I shot a couple dozen shots each time. The creep is very predictable, as you say, and with practice you can squeeze it to that point, take a breath, and then do the "final sequence".
(For those of you reading this who haven't figured it out, I bought this gun from Chris. We're talking about this specific rifle; my son's Optima has no creep in the trigger at all.)
I shot a few 1 inch groups with 110 grains of 777 ffg and 240 grain Hornady XTP. The 777 pellets didn't shoot so well. I decided to go with the Hornady 300 gr XTP and 110 gr 777. I tried lighter loads of powder but didn't get as good of groups. The 300 XTP shots about 1.5 to 2" at 100 yards, and I think it will be a better terminal ballistic load.
I hope to have a success story to post next week; I have a few days vacation coming, so I should have at least 4 days in the field next week.
Remind me, what are you using this fall?