Hey Neptune5K,
I have used several of the Meanwell PSUs with TECs. Both a SP-320-12 and S-300-12 with a 226 watt was very stable. I could easily adjust the voltage in 0.5 V increments and hold it there for several hours. The voltage will change initially as the Pelt cools down but once the temp stabalizes the voltage should to.
As a Pelt changes temps it will induce a reverse voltage onto the DC power source (Seebeck affect).
Try setting your voltage once the TEC has reached equillibrium - then it should be solid. If not, something may be wrong. Do you have good tight connections on all the leads?
Good luck,
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