69 Chrysler 300 A/C

Couple of questions,

With car at idle (1000 rpm) both A/C belts run smooth, with A/C ON the belts start bouncing around and look like Oscillating Sine Waves. I've tried 59" belts and 59.5" belts. I've tightened a fan belt or two in my day. Why is this happenening?

A/C was serviced, held a vacuum, re-charged about a month ago (R134), was blowing 40F air at 70mph. Today A/C is blowing 50F-55F air at 70mph, but it is almost 100F outside. Is the A/C output air dependent on the outside air temp...

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Author: MJFUR