I have also had issues getting the receivers to recognize all polarities with legacy lnb's and switches. I had a 211 that used to work with sw-21 and a couple of legacy lnb's no longer work and had to switch to DP lnb's and switch not long ago.
There used to be a website with all the different set-up diagrams that could be done with Dishnetwork, but it's gone now.
I helped with a set-up where a DirecTV Phase 2 dish was used, using the 110/119 LNB's for Dishnet ( not using the DirecTV 110 LNB ), and the 101 LNB for DirecTV, all on one dish. Later a single LNB 18" dish was added for 61.5 ( I think ) using SW21's to combine the signal.