I work as a small engine technician. 130 psi. is about minimum for that engine. That said,
In defence of the other tech., I test compression on almost every 2 cycle that crosses my bench. So far, I have gone through 5 compression gauges in the last 8 years. Usually they gradually start reading low and it takes a while to catch on.
Unless you have a crankcase leak, like a bad seal or something like that, your trimmer should run with 130 psi compression.
Most likely you do have carburetor problems.
You do really need to take the muffler off and make sure it and the exhaust port are clear of carbon. Also, a plugged exhaust can cause an abnormally high compression reading on 2 cycle engines.