Based on what you have said, I would strongly suggest that you do not mess with any adjustments in this radio.
The question is always: what power meter are you using, and what is your test setup?
(If I had to guess, I would say your radio is fine, and your power meter is not a real PEP meter (which is why you are not seeing the power you expect). This is almost always the case here. But maybe I shouldn't assume. ; )
Either way, you should stay out of that service menu unless you have access to proper test equipment. Otherwise this usually ends badly. (If you don't believe me, have a search and you will see how many people thought they knew better, and then had to ask for help (or send the radio off for repair) because they messed up their alignment settings and then couldn't get them back to how they were)...