Scott- Sounds like you are undercharged or you've got moisture in the system. Bubbles in the sight glass indicates one of the above scenarios. HOWEVER, in your original post you quoted pressures that made me think "overcharge" . When you charged it, did you have the decklid down, system set to coldest temp,highest fan, and did you have someone keep the revs up to about 1,800-2,000 rpm? If not-check it again. Once you change things from OEM, you can't just "weigh in" the charge. As far as the thermostat cold control: Like you're ever going to set it to anything but the coldest setting
as long as it keeps the compressor on, don't waste your money and effort on that!