Chainsaw Repair

It will not hurt to loose the base gasket but I usually have to take off another .020" to get a squish of around .025". 
I can then start to get 140 to 150 psi on the compression.  But these saws actually run very well and cut good at the stock compression and unless you just want to modify the saw I would not worry about it.

Rings are cheap and easy to do so I would replace them.