That engine has low compression "bathtub" heads from the factory. I'd think 90# compression would be about normal. Your readings are over 10% less than normal, which usually indicates a powerhead problem. Good idea to check with another compression gauge... Engine tuner is always a good idea. If your engine has a lot of carbon inside, I'd expect the compression to come up somewhat after doing the cleaning process. Does not hurt to do it a second time, if you see some improvement.