You should really watch the pressure on both the high side, and low side when charging the system. The only real way to optimize the A/C charge is by calculating the pressure differential in relation to the temperature of the compressed freon/refrigerant. See if there is someplace near you that you can borrow a guage tree when you charge the system.
If you can't find a tree, I have a spare set. Drop me a line and I can loan it to you. If you were closer I'd have you stop by the shop and I'd hook it up to the charging machine
We worked wonders on Speedy's system when he was here for the belt gathering.
Let me know.
-Nick
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Owner: Bennington Motorsports
www.benms.com
Sponsor for Midwest Region 944-SPEC racing series
-When was your timing belt changed or tensioned??
-Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP.