I have 170 and 175. I am 6'5. I couldnt care which I use. I am not a refined enough rider to care about 1cm of difference in my pedal stroke and since neither is too long for me, its not like my hips will hurt.
You have been riding for 3+ decades and have road bikes, town bikes, and a zombie killer. You have toured Europe and locally. I am sure you have enough experience to share too- what have your crank lengths been and how has it affected your riding?