Maybe.

The rudder inputs often produce different coupling at KE compared to level flight.

For example, at KE, the AOA on the wing is probably 0 compared to a bit positive for level flight. This change in wing AOA changes down-wash which in turn changes the AOA on the stab which is one of the causes of coupling. In other words, you need different elevator trim for KE vs level flight, hence the mix.

I've had some planes where the mix really messed with normal rudder inputs, such as stall turns. For that reason, I typically put KE mixes on a switch.

You might try adding rudder in level flight and note what it does. Maybe you want the mix on all the time.

Cheers