If you can see sometimes runs too lean but other times ok, then this suggests again might be a clogged filter problem, it won't be down to the mapping with karl having done it.
Unless you have chnaged spec since the mapping it won't need remap.
The chips do actually wear out, amazingly it's true but not that quick.
My philosophy is fix what you know is wrong even if you think it is not related as it needs doing anyway, sometimes you get a nice surprise and it fixes other problems.
tabetha