I have a similar setup and have a dual lnb, One reciever controls the motor and the other feeds direct from the lnb. I also have a fixed dish for 28e which is the most used which feeds both recievers and a sky box. So
Reciever 1 TM500 - motor control of td110 + 28e (when I get the settings right)
Reciever 2 Fortec - 2nd feed from td110 + 28e
Reciever 3
Sky box - 28e
I found this works best for me.
