Okay it's hard to keep up with all these things that are happening and what I'm changing to make them happen but here goes:
First off only the first name before the @ is in Actual Character name (if different), and I changed the characters' names in the top left to add the @____. Either I'm crazy or you edited your post, but anyway the first thing I did was delete the SLOT 4 and SLOT 5 part of binds.txt and after launching the team 1. Invite no longer worked for SLOT 3 ONLY and 2. Follow worked for SLOT 2 ONLY but not combat. SLOT 2 would follow me and then once I started auto attacking he'd just stand there. I have my SLOT 2 and 3 in Fire Group 1 and all 3 slots in Fire Group 3 (I was told that's the "attack what the leader is attacking" group).
This is exactly what was happening earlier - one of the 2 slots would follow and for some reason it's now giving me the "cannot find player, try using @handle, etc." error when trying to invite SLOT 3. It's just "Coda@balfhedii" no spaces or anything.
I also tried deleting the SLOT 4 and SLOT 5 parts from the characters' specific binds but every time I export to Inner Space they get overwritten. And obviously when I changed the character names to include the @_____ in ISBoxer it created three corresponding character bind .txts.
I'm about to go through the process and narrate as I go:
Launch team, log in to each of the three accounts
Mass invite - SLOT 2 gets it, I get an Error Inviting player (not found) for SLOT 3
SHIFT + END to invoke - all three slots try to invoke (WTF?)
/unbind_all on each slot, try inviting/invoking, nothing works (as expected)
/bind_load_file isboxer-binds.txt on each, try inviting/invoking, same as before - SLOT 2 gets the invite, all 3 can invoke - FOLLOW does NOT work for any slot
/bind_load_file
isboxer-3man-Rotand@tfabalfhedii-binds.txt, etc. for each slot - NO CHANGE
Here's my version of the screen shot you posted:
Current ISBoxer cfg: pastelink.me/dl/e1c2ca#sthash.CDCGCO8N.dpuf
I feel like I'm writing a lab report but hopefully that's all the info you would need.