It's odd that your feet hurt while leaning in a saddle but not when you are standing in a loc-on. What kind of feet pain are you experiencing, or where is the pain occurring specifically? When you lean you say that the pressure of the platform is more on the arches of your feet. This may be out of left field but have you looked up the symptoms of plantar fasciitis? It can happen to runners, bigger fellas, and in shoes with poor support.
The lacrosse grange definitely suck.
I know everyone different but..... I seriously don't understand the boot issues. I'd guess over 80% of my saddle sits have been in crocs and the other 20% are in thin rubber boots. The angle of the platform is the issue not your boots or tether etc IMO. I understand not everybody can make their own stuff and no commercial platform has tackled this issue....
And DanO from eastern woods outdoors sells something just about like this with bolts and it works great because it can be angled to match your feet!!!Somewhere I posted using box tubing to ease pressure on your feet while using bolts. I made these as an exercise to try it out and the 3" box tube worked great. My example is made of steel tubing but aluminum box tube would work as well. The round tubing is some aluminum tubing that I happened to have and it worked almost as well but the round tubing was a little small in diameter. You could use PVC or conduit too. They don't have to be super light since you only need 2 pieces for your main platform bolts. They could be drilled out as well... Just another way to skin a cat.
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3 suggestions:
2) get a platform that you can angle downward so it’s easier and more comfortable to get your feet flat.
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