Glad you got that figured out.
I'm 6'4". I have to stand upright a lot. That first 15° of bending with a bad back is rough. Having to do it all the time is too rough.
I understand where you're coming from with that. I've had 2 inflamed ligaments in my lower back now for going on almost 2 years. The doctor told me it takes a lot of time for things like that to heal but who can afford to be off work for that long? They don't bother me too much as long as I don't stay bent over for hours on end. But when you have to tie rebar, finish concrete, or any number of other tasks for hours on end, they do get to aching! Cruising is suppose to be an enjoyable experience so I'm not going to make it hard on myself by owning a boat I can't stand up in.
If good seamanship is thinking ahead and being prepared, then I'll have made a good start by keeping the pain out of my back so I can better deal with the pains that come a few inches lower!