Again:

I know of NO stretch tune that would turn an E into "almost an F".

Something else is wrong here, might even be a hardware fault in need of repair.

But it is not any sort of standard stretch tuning. Not with that large of a stretch.

It *might* be that the way they did the stretch is broken, though, would take a trip to the uthorized service center test bench to correct.

Whatever the reason, what you've described cannot be proper operation.

--Mac