I have a fairly stable leg with and without stirrups. It's keeping my heels down that is a huge issue. By doing constant stretching I am slowly able to lengthen my tendons so that I'll be able to get my heels lower, but that takes a lot of time (it's a long-term thing, not something that'll be fixed in a day). My question is, how important is it to get my heel down lower? Should I be investing more effort, or perhaps focusing on something else (if so, what)? And if it's that crucial to get my heel down, what are some tips to get a lower heel?