Chainsaw Repair

I've replaced crank seals, installed new rings, did not port exhaust port but did modify the carb plastic manifold extensively and widened intake port. Removed cylinder base gasket, milled cylinder flange .020 to achieve a .020 squish and still my compression is 125 psi a gain of 25 psi over stock. From what i've searched stock is near 150 plus, so what have I've over looked in rebuilding this saw. If I apply a light film of motor oil to coat rings compression shoots to 160psi, which would be normal I assume improving ring seal. Any suggesting
to what I'm missing or should I just run the saw like it is?  Also the rings are thin style

The the saw has an hour run time.

Thin rings. bought six sets and they seemed to have good tension.

yes it's a Lisle. The black craftsman I bought from you and partner R16 i have register 150 plus and my 3.7 125 psi. you can tell the difference just by pulling. Now when I apply oil film to the 3.7 the difference is night and day. When I first pulled this saw apart the piston, ring grooves and bore was in mint shape but one of the three is keeping it from building pressure or poulan at the time machined the compression chamber different to lower compression for craftsman, just guessing here.
 

Runs real good now,like you said gotta give the rings time to break in