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Bill
It seems from your experiment and pictures that the focal point for the "sun light" is higher than the LNBF holder location. Could that be because you are using the light from the sun which is higher than the satellites and not over the equator? Thus the angles will all be different.
Remember, the dishes are designed for satellite signal with fixed satellite location (vs variable for the sun).
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I don't think I explained well enough what I was doing. I was hand-aiming the dish at the sun, trying to get it to focus on the lnbf holder. No matter where I aimed it, I could not get all 5 mirrors to hit the same spot. My moving the dish, I could get any one of them hitting the spot, but not all 5.
However, by moving the dish, I WAS able to get all 5 to converge on that spot 2.5 inches away from the lnbf holder. If I tried moving the dish, to move that converged spot down and right, it would immediately break up into 5 separate spots.
So it's not that I had the dish mounted following satellite arcs, I was hand holding the dish,
aiming at the sun. That point above and left of the lnbf holder appears to be the true focal point of the dish, it's just that the lnbf holder doesn't put the lnbf there.
It's possible that the lnbf arm is slightly bent, although I was careful with it. It does look like it isn't quite perpindicular to the dish surface. I'll have to measure it's position relative to each side of the dish to be sure.