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I see what you mean...
what can I say...probably the belts installed on your machine are a shorter than mine.
I made the design based on my CR-10 (that I supposed was Standard, and as you can see from the pic in the model is fitting correctly) and giving quite enough clearance for tight and release the belt.

Unluckily, in this particular case I think I cannot do anything for help you :-(

Sorry mate!