what is the deal with my 225 /six compression?

Doesn't matter. I have done a compression test with the throttle at idle then propped wide open (noticed mistake) and no difference in readings. By removing all spark plugs, the engine spins a bit faster since less load on the starter. Probably doesn't matter and is perhaps a bit cheating to fudge the readings upward from "normal cranking" condition. You must remove all the spark plugs anyway, so why not initially? Smart to put a rag over each hole so you don't drop anything down.

I should mention that you can get an excellent indication of cylinder sealing without a compression gage. Just slowly turn the engine over by hand and feel for 3 strong "air springs" per revolution (chalk mark crank pulley). If you hold at each and it takes >5 sec to leak down (should hear hissing), that cylinder has excellent seal (valve seats and piston rings). You can turn a slant over by pulling/pushing on the fan belt, and an easy test when you looking to buy a car. Just insure the key is out, or better to remove BATT- cable.