You did the right thing, and saved yourself a bundle. Go to this site....

http://au.geocities.com/ozbrick850/aircon-keithP.html

It provides a nice 15 minutes of reading, and is about the best air conditioner description on the 'net.
If you scroll down to the very bottom of the "leak procedure" section, you'll find a sentence that says that normal operating pressure will be somewhere around a low of 20 psi, to a high of around 40 psi. It takes quite a bit more pressure to trigger the "high pressure" switch, and still more Freon to reach the point where you'd be flooding the expansion coil. All of these numbers are approximate, and are there are many variables. "Hamfisted" suggested that you may have overfilled a bit, and he is probably correct. If you bleed a little bit out (just to be on the safe side), that's cool (no pun intended), but you might want to check it again in a week or two. If the pressure is somewhat lower at that point, it's probably due to a slow leak somewhere in the system. Static pressure is almost meaningless... only the pressure reading when the A/C is running, and the cabin temperature has stabilized, is important. Put it on "recirculate" and "high" fan speed, then let it run for a few minutes holding the engine at a "high idle"... approximately 1500 RPM to get your most accurate pressure readings. Considering that the replacement of the evaporator coil (the most likely leak source) is a major task, both physically and financially, a couple cans of Freon a year is the better solution, at least for now. But hey, summer is almost over anyway...just a few more weeks.

Good luck

Marty
'96 855T