Attached is two OBD-II scanner recordings owner did once engine failure was repaired and doing a cruise still using the so called custom tune over 2 different days to verify engine and the collected data.

It is clear that even a low engine loads the fuel trims were as much as -16% too rich which does not help washing down the piston rings, exhaust makeup to sparkplugs, O2s and CATs

Not what you'd expect from a custom tune