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@dancing james
Going lower means less weight is stacked on the discs, the discs are now substantially thinner than they should be and the vertebrae have been wearing against each other.
My folding bike is the least comfortable as I am in the most sit up and beg position, road and skidder bikes are fairly identical with approx 8.5 cm saddle to bar drop. This bike was not so good earlier this year, I had set it up with about 7.5 cm drop but got better when I move the bars lower.
Had decided to return to my fit data from years ago when I was not doing so much yoga but even on the 3 mile ride home I was feeling more of the road buzz in my spine. Will try it again tomorrow when working and then consider juggling spacers until I find the sweet spot.
My bad discs are l2-l3 and l3-l4.