Really? My results did vary from your finding.
Definitely. A bull bbl takes out the harmonics and vibration issues associated with the thinner barrel and it's contact with the barrel band.
OP, i think a 452 Lux vs. 10/22 thumbhole bull bbl is like comparing apples and oranges.
I have both, and another two 10/22's as well. I use the 452 Lux with irons, and the bull 10/22 with a Mueller scope. Both rock; but serve different purposes.
The CZ 452 Lux is a wonderful gun for hunting, but it would not be my choice for a range / benchrest rifle. I think your comparison would be more fitting with a CZ 452 American, or a 10/22 in carbine form. (They can be made accurate too.)
I get the impression that some of the posters here are the sort of shooters who buy a gun and use it as-is; whereas others (like myself) really enjoy the mechanics of the system and being able to make minor or major adjustments as suits our fancies.