Yeah, I'm going out a bit later today to see how the position affects my muscle engagement. If I end up using my quads more, I'm going to feel it! Was watching a Phil Burton fitting video and he gave the analogy of if you stamp straight down on someone's hand, you're more likely to break it than doing it at an angle which explains why the pros go as far forward as they legally can.I'm like you prefer sitting rearwards over the pedals for the same reason as you and use my quads more, as I am of short leg and long back this helps me keep 'balanced' without too much weight on the arms(I ride a custom frame with long top-tube and more laid-back seat-tube). KOPS is a bit of myth, but a good starting point.
My bars are slightly lower than the saddle, am overweight with a bit of a belly and my neck is not as flexible as it once was. My saddle is quite high and has been criticised but my hips don't quite rock.
And yes, I do get lower back pain after a while, and I have thought that it's as a result of both using the quads more and being a low cadence/high power grinder which (I think) puts more pressure/strain on the lower back muscles.
I do find I can keep going and more often than not the pain recedes but never quite completely goes away. I don't tend to do much stretching between rides, but will do when am out if I feel necessary.
So my thinking is think about whether you grind-away (especially as I do uphill) in a high gear straining the lower back, or whether spinning a lower gear might help?
Is it an issue for those of us relatively long-backed?
Do you get back-ache from a long walk?
Yoga with Adriene on youtube has some good short beginners work-outs as well as back-specific programs that might also help.
My saddle is at the right height for me I think, any higher and I'd be at risk of fully locking out my legs. I've moved my saddle half a cm forward for today's ride (30 miler) to see if there's any difference in back discomfort and raised by 0.25cm to compensate for that reduced distance to the pedals.
I'm more of a spinner myself, don't have a cadence meter but definitely on the higher end of the scale. I'm usually running a 30/11 on the flats and that suits me. On the hills, I'm spinning away on a 30/28 or 30/32. The only time I do tend to grind a little bit is on false flats (2-3%) and then I will usually drop my cadence a bit, just personal preference.
Weird you mention that about walking In my memory no, but the last time I did any sort of "long walk" was over a year ago, when I worked as a waiter. After 8 months one of my feet gave out as I had major premature cartilage decay, so I'm unable to walk more than 30 minutes at a time now. My bicycle is basically my mobility scooter!
Will look into that Yoga channel, thank you