that wobble can originate in the crank gear the timing belt runs on. Check that the timing belt isn't wandering on the cam gear sprockets. Check the 4 10mm bolts holding the harmonic balancer are torqued tight. Remove the belt and check the balancer grooves are clean, inspect the belt. I see the in...

We've had that issue here a while ago. I can't remember the solution, though.
Have you tried the search function?

My Gates belt wandered when I installed an Aisin kit on my 1996 20V, but not enough to squeal. I simply did nothing about it. I haven't even pulled the cover to check on it. It's had many miles put on it since installation. I can understand the sound being quite concerning.