I think your issue came from not securing the homasote down tight enough. I used 1/2 plywood and 1/2 homasote glued down on top, weighted **** near everywhere on top over night. Mine has been up over 3 years with no issues and flat as a pancake. I think I used liquid nails. I'm guessing you'll need a putty/mud of sorts with a little sanding to get it good and flat. Shouldn't be too bad to work past. Good luck.
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