[ADTech]

Your signal path profile indicates you have a very substantial hill in your way (or you are in a valley). Such situations result in diffracted signals that will be quite non-uniform, even for different channel signals from the same antenna or tower.

Therefore, you're probably going to need to experiment with the antenna's mounting location to see if you can find a spot where the signals all happen to coincide.

I'd probably also loose that particular pre-amp. You have full-power stations dead ahead at only 5 miles and you're probably either getting IMD splattering into certain channels or are getting spectral regrowth into others.