I don't have specific info re. CH-31, though reports of stations recently switched from digital to analog failing have been somewhat common. Searching through or inquiring at digitalhome.ca may provide an answer from folks in the area.
If you want to continue to experiment with cable lengths, try changing the length of only one at a time, and then, only an inch or so at a time.
If it's practical, you can also make slight adjustments to the separation distance between the two antennas.
Yes, this can be tedious and it may result in improvement of some signals at the expense of others.
I can not recommend the LAVA 2805. It has a reputation for mechanical failure (plastic parts) and an amplifier that can not handle the strong signals shown on your TVFR.
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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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