hi,

Thanks for that. I agree, at the moment, the only way for you to bend lower is to bend your back.

What i am suggesting is to bend from your hips (i know you don't get far) and to use that as your exercise/stretch to increase how far you can bend from the hips. Ideally 80degrees from vertical would be nice (nearly horizontal) but i would be happy with 60deg

And again, i don't think it is your hamstrings that are tight, more like they are overactive (switched on too much) or that the sciatic nerve is physically shortened for some reason.

thanks!