Multiple MIDI Controllers and Multiple Tracks

I have a Logic project I am working on that has 5 MIDI instruments. 4 of them are set to be on MIDI Channel 1, and the other is on Channel 2. I also have two MIDI keyboards connected; again one on Channel 1 and the other on Channel 2. I have all of the tracks record enabled.

I would like to be able to record to the 4 "Channel 1" tracks simultaneously with keyboard 1 and the other "Channel 2" track with keyboard 2.

When I enable the "Auto demix..." option, only the first of the 4 "Channel 1" instruments are recorded to. If I disable "Auto demix...", both keyboards control all of the instruments.

If what I said makes sense, does anyone have a solution?

Thanks in advance,
Ian