OK, now we have almost all the information we need to solve your problem. Apparently you really do have two Dish 500 dishes, which will only pick up 2 satellites. I'm surprised you are happy with this setup for your HD receivers, because you can get a whole lot more HD channels either by swapping out your 500 for a Dish 1000, or by adding a wing dish for 129 or 61.5.
Anyhow, the final missing bits of information are what type of dual LNBs you have on your outbuilding Dish 500, and what type of switch you added. Your 211 can handle anything. But the type of LNB and type of switch have to match. That is why I suggested buying a legacy, DishPro, or DishPro Plus twin LNB, since these all have integrated switches and therefore can't be mismatched. If you have legacy dual LNBs, then the cheapest fix is to acquire a SW21 legacy switch. If you have DishPro dual LNBs, then the next cheapest fix would be to buy a DP21 switch, if you can find one. (They're discontinued in favor of the DP34.)
What you have now on your main house is a DishPro Plus twin which has two advantages over the earlier twins. It can drive 2 dual-tuner receivers such as your 612 via a single cable (for each receiver), and it has an input for a wing dish. The latter may be important to you when you decide you want the HD channels that only exist on 129 or 61.5.