The true thrust can be wildly different

change prop/exhaust system AND position of cowl to prop ( extend the spinner out in front into cleaner air)
thrust will run from 35 - 45 easily and on right exhaust setup - much more I played a little loking at tihese measurements
My piped Super 80 turns a Mejzlic 27x10 at 6500 -on the ground- on an IN cowl muffler that rpm drops 500rpm +-
how much static thrust is that? I never measured it
switch to a good 26x10 and you may easily beat the 27x10 (on incowl muffler ).-- for static thrust
my 23 lb plane does rocket out of hovers and unloads (easy to hear it happen) as it accelerates vertically rolling.
at 22 lbs with the in cowl mufler - and ZM 26x10 it was still very good and ran 7000- 8000 static to level full speed rpm measurements
I personally don't pay much attention to the static listings -I go by best static AND in flight performance