I didn't mean with a torque wrench but approx by feel. What's the deal with the disposable Nitrogen tank? It's a nice resource if it works. You say you lost some through the regulator. How did that happen? Care to provide some details?
As far as finding leaks at this point, did you see my thread
http://www.peachparts.com/shopforum/diesel-discussion/379323-cheap-harbor-freight-elec-refrigerant-leak-detector-test.html on testing the HF electronic leak detector? My test was with R152a and R12 but it should work with R134a also. For very slow leaks, the pick up has to be real close to the leak point but the HF unit works. If your R134a hasn't all leaked out yet, on a 90F day, static pressure should be around 100 psi so you may be able to find all the leak points (before the R134a emties).
Don't know what you are paying for R134a but 2 x 10 oz cans of R152a can be had from Walmart for $5. That's what I am running on now- getting 40 F vent temps on a 90 F day. If you decide to go that route, do not put the full 2 cans in there.... it's too much....more like 1.5 to 1.75 cans is sufficient.