pinbuster,
I wonder if your heel-toeing change might have caused this problem.
I may not be as big or as heavy as you but my weight also cause slide problems sometimes; I use Linds EXXXtras, with the quarter sized inserts.
Anyway, the modern shoe uses the sole to slide and the heel to brake. It can cause problems when you have to think your way to doing this,but could you be starting your slide with your heel too far down, in contact with the approach, rather than placing it down fully as a brake, at the end of your slide?
Personally I can't think in this way and I have slippery inserts in my Linds' heels as well as the sole. I also have "risers" under the inserts which raise the level of the insert above the level of the surrounding leather to insure they are what I am sliding upon. Normally one's weight pushes the inserts level with the surrounding leather.
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"When we choose an action,
we also choose the consequences of that action.