The Stall Damper Check is the only official check for the stall.
I have encountered this as well with compressor sections that are machined to such high tolerances and therefore "overpowering" the rest of the turbine.
We had all the same issues and just ended up replacing the engines. The replaced engines were all +12 as well.
If you think it is location, why don't you swap engines left to right in the airframe and see if it duplicates.