[wejones]

I think you should only use one receiver at a time until you get it working.
What transponder is it that you are actually getting on AMC3? And what transponders are you trying to get that you can't get? There have been several changes over the last few months on AMC3, so as Steve said, it is very possible that you are looking for transponders that just aren't transmitting.
I'm confused about the receiver telling you what sat you are on... I didn't know any of these receivers could do that. If they CAN do that, they probably need an up to date transponder list, but I'm still curious about this comment.
But it sounds like you are pretty close on the angles (assuming you're using a latitude scale and not an elevation scale), although I would have thought that your dish elevation would be a little lower, like 24, but you're pretty close. And you're using the right LO freqs. But you haven't explained how you have the system wired. Ie are you using diseqC switches to bring both L/C signals down one coax? If so where is the switch, and are you sure you have it set up right in the receiver?
Are you trying to peak the signal on AMC3 with the receiver and TV out at the dish? It's hard to peak one of these things if you don't have a way of seeing signal level while you are moving the dish.