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Maybe the bad feet is smaller or has less volume...
This is what I would try, btw no idea exactly you have the blister but this can help you to tweak the thing.
If the heel is lose you have to move the foot back a little bit, to do that just put a little piece of handlebar tape perpendicular (side to side, not along the shoe tongue) at the top of the shoe tongue, that will shim the foot to get back a little bit, firmer grip of the heel.
Personally I do not like the solution of putting something in the heel.
Another solution that could mix with the handlebar tape thing, is to get a smaller insole, like half a number or a number smaller, that will make the heel go lower and fit better, then put the tape at the tongue.
Hope this helps to get creative because pretty much is a thing of test what works for you the best.
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