Stupid servo question

[Cosmology27]

Played Thermal Expansion a lot a while back, but I'm new to the new way of doing it.
I have an ender chest (same pattern) for the input and output chest, for my energetic infuser.
Goal is to have a single ender pouch that I can shove my electronic junk in, they'll be put in the infuser, recharged, and shoved back in my pouch. This allows for me to recharge everything while I'm out.
It DOES work, but only if I have a single slot used in the blacklist for the servo.
If I have more than one thing in the blacklist, it stops working...

Anyone have any idea why this might happen? Or how to fix it?

 

[Pyure]

are you able to put the servo into whitelist mode, and fill no slots?

 

[Cosmology27]

If I whitelist with no slots filled, wouldn't it then never suck anything?

 

[Pyure]

You'd think so, but I feel like most interfaces work counter-intuitively in that respect. An empty whitelist actually means "no whitelist requested" instead of an empty whitelist.