BB TTI 2" header hot start problem

The old starters slow cranking hot, was generally the armature/fields expanding with heat, combined with worn armature bushings, allowed the armature to literally drag on the field magnets, leaving witness marks on the armature . The more power supplied to the starter (boost) made more magnetism, causing more drag .
The new starters are a smaller version, I'd be curious to see if that armature is dragging hot ,and if simply a bush/bearing change would cure/improve it .
I always take broken stuff apart to find the cause, and perhaps prevention .

EDIT