Hello,

It sounds like you are using Dual Mode. I would suggest using Insert Mode instead: https://cdn.eventideaudio.com/manuals/h90/1.10.7/content/edit-modes/routing.html

If you place the insert with the IR-X at the beginning of your chain as shown in the image below (ignore insert 2), that should sound the same the guitar going straight into the IR-X and then out to the H90.

You can place Insert 1 between Preset A and B to get the Pre/Post configuration you are already using.

You can save your insert routings with each Program so you can get these different configurations by simply loading different Programs.

Let me know if you have any other questions.