That is great information.
Also I should let everyone know That i drove the truck to work on Friday when it was around 85 degrees and the truck performed flawlessly. I am thinking maybe it was a problem with the air flow across the condenser. I out a new viscous clutch fan on the truck a couple of years ago but it was a cheap one i am guessing it may not be working properly.
Always charge with a big box fan blowing across the condensor to imitate road speed, especially with clutch fan systems, now adding oil, if you didnt see signs of oil leakage around any joints will have effectively changed the volume of your system and will throw all pressure readings to the four winds, you now have to just throttle the juice in till it feels right. For the kinds of temps you have been having outside, 45 on the low is a near empty system if you were charging mid day, screw the charts, I think those things were all written by someone in Manatoba. You should bee seeing around 65 of so on the low side mid day ( this will change drastically at night , but do not expect the system to cycle during the heat of the day). and look in the archives for the heater valve bypass, if you havent done it yet... do it, otherwise you have hot water flowing through the dash at all times, this will shut it off while ht eac is on high.
Lastly, these trucks, the fittings ford used, are notorious for leaking when r134a adapters are left in place, so once you install the refrigerant and get it all set, REMOVE the adapters and tag your lines that the system containes R134a and cap off the old R12 fitting( you will likely need new valves if an adapter has been in place before they squash the r12 valve and jam it open in some cases) if you were smart and got some nylog for orings, put a little around the valve seals. On most that I have run across where they have been converted and they leak, the sniffer doesnt lie, the valve adapters have been the culpret in most cases. And do make sure to run the vacuum for a good long time like overnight if the system has been out of use for an extended period, you are not just removing air, you are boiling and removing water at ambient temperature with the vacuum pump, if you dont get it out, you will have evaporator icing.