FYI for anyone that was following this thread...
I re-checked plumb each way and did all the usual fine-tune steps to no avail.
I was getting occasional "Check Switch" errors, but it worked fine 99% of the time. I thought that my long runs (~ 200 ft) may be causing it.
But when I was getting that error, and tested the switch, it would say "Good connection - No signal" for the 110 sat....which led me to believe the dish needed pointing. (119 was good on both ports, even and odd).
Yesterday, without changing anything else, I put a spare DP 500 LNB I had onto the dish. Went back in the house to check, and all of my 110 sat signals went up 30 points! My 119 signals went up 8-10, so those are now in the 80s/90s. :up
It looks like the LNB was the problem after all. I'm going to try and fine tune a little more, because with my line of sight, there's no reason why I can't get more (Yes, I'm greedy

)
Thanks to all that responded.