Can you tell what real channel numbers are you picking up (analog and digital)? For you digital channel, can you get your receiver to tell you the real channel number? With so many repeaters around, it would be nice to know which signals you are really picking up.
The transmitters to your north are predicted to be much weaker than the signals from the south (because terrain is blocking the northern transmitters). It makes me wonder if you were picking up a signal bouncing off the hills when you pointed your antenna north. The transmitters to the south should be line-of-sight (hence the LOS path indicator). Are there any trees or other buildings blocking your antenna's view to the south?
BTW, as a general rule of thumb, it's best to keep the antenna at least a few feet away from any other objects (like your metal roof). Anything conductive near the antenna can change its electrical characteristics. I usually recommend putting the antenna at least about 4-5 feet above the roof to reduce the influence that the roof has on the antenna's performance.
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So if I get better height up a pole or mast, but have to increase the length of coax to 100 feet, then will I need an amp with the UHF antenna or do you think I should try it like that without it?
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How long is the cable run now?
For lengthy cable runs, a pre-amp can help. Yes, you can try it without the amp first and add it later if needed.