N54: Does "Fuel Mode 6" indicate a problem ?

Hello,

I noticed while logging "fuel mode" that after a long pull, the fuel mode 6 is triggered for a short period (1 second or so) on let off.

Let's say i WOT 3rd, 4th and a bit of 5th then it will trigger fuel mode 6 for 1 second or more at let off in 5th, and come back to fuel mode 2.

Does this indicate an underlying problem ?

I understand that it's based on estimated EGT by the DME, when it's too hot, fuel mode 6 is triggered to cool down the cat with running richer.

I have catless downpipe, but i wonder if high EGT could happen because of "bad" secondary cats? or just normal?

Thanks for any hints :)