Update! The special schrader valve in my sears/actron tester was bad. I took it out to inspect it and it fell apart. I suspected something was up when I tested it again and the compression jumped up to 140 and then dropped to 100, then to 0! Problem now is sears disco'd the part but it appears similar to what the other testers use. It has to be a special light spring, the bike or car ones are too heavy to let the compression by properly, or so I'm told.
I also pulled the t5's off to replace the o ring and took a look at the piston/cyl. Looks like new, no scoring, carbon on piston sides, etc.... will let you know what I find when I get the tester fixed.
Thanks