You're doing remarkably well as is. I doubt that quadrupling the height of your antennas or replacing them with custom built designs that added 10 dB of gain compared to what you already have would give you much improvement. It simply boils down to the variability of the path those distant signals have to travel.
Having given my two cents, please don't let me discourage you from experimenting... I find that to be more entertaining than much of what I see on TV.
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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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