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I would opt for even larger... If you're favoring the Antennacraft products, the HBU-55 is not over kill by any means. The equivalent competing product from Winegard would be the HD7698P.
My choice would be to go all the way, an Antennas Direct 91XG and an Antennacraft Y10713 into a UVSJ then into the preamp (which should be no more than a few feet, as the coax runs, from the antenna(s)). Stack the two antennas UHF on top & the H-VHF at least 3' below.
It sounds as if the existing preamp is still functional... No harm giving it another chance. But you could squeeze a dB or better noise performance out of a switch to an Antennas Direct PA-18. I would even consider installing a dedicated preamp on each antenna, then combining down stream of the power insertion blocks. Each dB of net system noise figure is precious... Which is why the preamp(s) need to be close to the antenna(s)... every dB of loss between the antenna and amplifier is a dB of NF you'll never get back. If you have 100' of coax between the antenna and amplifier, that could translate to a loss of 5 to 6 dB of net NF.
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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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