I have a tow package and I dont run with ESS disabled.Yeah, this is why I say still some unknowns as it's not as simple as "low altitude is no problems; high altitude is problems" so could even be some other option that modifies the tolerances.
Do those having the CEL have the tow package? I do.
Do those having the CEL run with ESS disabled? I don't.
All these things could be somehow interacting.