Voodoo, apologize for the late response. I initially used the routing tubes for my first setup but have since abandoned them completely. Although they do provide an optimal path for the filament tube to route up and out of the AMS, I like you, don’t have a setup that fully accommodates the routing tubes.
What I will tell you, however, is that you will need to make sure your tubes coming from the AMS have a clean flow and going into the FTS has a clean entry. After the new firmware updates that support the FTS, I had to do some rearranging because for some reason it appears that the firmware caused my AMSs that were connected via a adapter to stop working consistently due to high resistance. I think Bambu added some code to make sure that you don’t go over the 700mm PTFE recommendation. I’m only speculating but when I rearranged my AMSs to reduce the length, I was back to a clean functioning system.
With all of that said, just make sure you try to minimize your PTFE tube length as best as possible with a non-bent entry into the FTS, and you should be good to go. Happy Printing!!!