I've tried everything.
new belt and tensioner pulley.
I used a parts store belt and that screeched like hell.
So I bought the contitech belt.
That stopped the screech.
After a few days it developed a chirp.
This chirp is present at start, idle and throttle. It only stops after the car has been running for about 30 minutes.... sometimes.

So I put some belt dressing on it.
That stopped the chirp for a few minutes.
I stopped the car let it sit a minute.
When I started it up.
The screech was back worse than before.
So I sprayed more on and let it run as the instructions on the bottle say.
I pressed down on the engine damper there and no difference
I added some tension by pulling the tensioner pivot arm (top of tensioner spring) a little bit and no difference.
The belt feels tight.

Looking through old reciepts I replaced the damper a few years back.. less than 15,000 miles ago.

What am I missing?