I have experienced similar issues with getting my cleats back far enough
and it was solved by changing shoes both the type and size. Bont shoes
are amazing and worth checking out. They are incredibly stiff and
moldable to your foot and I have had no issues getting cleats back on
them.

Interesting journey you have had with your cycling and congrats on the big run improvements. I have done the Pose running clinics but don’t know as much about the pose cycling. I’ll have to look into it a little more.

With respect to getting lower, one thing you might want to check is how you sit on the saddle. I know one problem many people have, especially females, is that they don’t sit on their sit bones. Instead, they sit back on their butt which forces them to come upright to maintain a flat back. Just a suggestion.