No I’ve not tried them…because I only use engine components which can be installed in a legal certified engine.
Also, you might keep in mind this C145/O300 engine ONLY “makes” 145 HP when it turns 2700 RPM. While different pistons might raise the compression-ratio…that would only affect efficiency….and no actual HP increase would occur unless there was a commensurate RPM increase…and you’d likely not accomplish that because you’re planning to retard the ignition-timing.
I believe your plan would not only be a waste of time and money it’d also make your engine illegal and may conflict with any insurance coverage you may have.
Here’s what Combustion Technologies state: The Oil Scraper Ring is not used on this piston - top 3 rings only!
This Piston is not FAA-PMA approved and is for experimental or ground use only!
Notice that their piston charts do not even provide the actual data on the AC539021 pistons:
https://combustech.com/pages/piston-specs
And notice that since the piston you are considering does NOT have provision for the standard Oil Control / Scraper ring….it will only accept the top 3 compression rings. I suspect you’ll be burning more oil and running higher Cylinder Head Temps.
If you do this, to remain legal, you should re-classify your airplane into the Experimental Category. After you do that, you will find all kinds of new restrictions apply….and it’ll be unlikely you will be able to return the aircraft OR engine to the standard category without considerable money.
Sorry not to have happier response for you.