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It sounds like you're on the right track...
I like the idea of your antenna 12' above the roof peak. You'll likely have better quality signals to work with.
Run the mast ground to the electrical service ground as directly as possible, avoiding sharp bends in the wire. Even 30' or more is not too much length, just be sure to use #10 copper or heavier wire. The goal is to keep any fault current outside.
Then, even if it adds significant length to the coax run, locate the coax grounding block close to the electrical service ground. The mast ground and coax ground should not come together except at the point of connection to the electrical service ground. Only after passing through the ground block should the coax penetrate the building.
If the added length of coax reduces signal levels too much, the right preamplifier will overcome that loss. 100' of RG-6 will not have more than 6 dB of loss even at the highest UHF frequencies.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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