Matt are you getting squeal with both belts installed and adjusted? I know that the alternator adjustment or deflection is fairly high initially on A/C cars when the belt is new, and very hard on water pump bearings. The counter force on the water pump is the A/C belt. Both belts should be on to protect the pump.
The super distance between the W/P and crank centerline to the A/C compressor is also a suspect here as my belt flops some even at 700rpm.
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