I have a solution to a question I was going to post. The BLW settings on the plugin are where you set your modified bed level hight. I was fighting with this on the Main Page of OctoPrint. They'd clear out every restart, of the server or the OctoPi-service...dUH!
It came to me. Go to the Plugin, select Custom, then your needed specs can be entered in...and they stay. I put stiffer springs, longer bolts & a glass plate. My z-axis hight needed to set to 8.5, my z-height I set to 20, and my x/y I set to 10. It does give me a tad less space, but It is lining up correctly at the correct height. No more compressing the springs! This was on a Monoprice Mini v.1