Assist, however you do it, takes a little bit of time... roughly double your latency.
It is a limitation of warcraft.
When I want toons to change target, I have my master change target first.
If I wait a second or so, the slaves will correctly assist.
Whether I press an FTL DPS key (to kill a new target).
Or if I go with my assist key.
When I have my IWT toggle enabled, it works the same.
As in, if I give the game a moment for assist to work correctly, the toons IWT the correct target.
But if I switch, and immediately hit IWT, often that's too quick for assist to correctly read the new target.
For me, it's always been that way.
For the IWT key.
Ensure it assists the master, before sending the IWT Keybind.
If you want it to work every time, without ever going back to a previous target.
The only solution really is to assist first.
Wait a second (at least double your latency, which will probably be half a second or less).
Then hit your IWT.
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