Squirt some 30 wt or so (maybe Marvel Mystery oil if you got some around) oil in the dead mill cylinders and retest after a bit. Maybe the rings are stuck in their landings. If the numbers come up - you got a ring/cylinder problem. If they don't - valve problem. Those numbers are pretty low, but a Mopar engine will run on those "cold" numbers. I think wrench55 posted recently commenting on how low you can go on compresion number b4 that cylinder won't function.

My experience with cold numbers are not to trust the, Variables include the pistons have not expanded to give you the true hot working numbers. I have had slow starters/weak batteries give me lower numbers. BTW, 4 revelotions of the piston should be all you need w/electric starter whaling away. I have never done a kick only test. Maybe one of the above is the difference when you compare to your 836. I am assuming that the 836 was tested cold also.

Take off tappet covers on the ZERO pound cyclinder and see if you can observe the valves going up and down while you slowly turn it over. Hopefully, you have a stuck valve. Sometimes they will free up with running or a little persuation.
I got a suspicion the this bike bike from hell desrves its moniker.

Confucious say: Man who lay woman on ground gets piece on earth.