I use commercial buckles which look identical to yours but I use 5mm thick neoprene (synthetic rubber) material for the belt. I find the thicker material more comfortable. It's stronger and less likely to strech too far and slip when fully loaded ie over 20lb of weights. It fits in a standard buckle so I doubt belt thickness is the problem. As hinted at the buckle needs to be fully closed but more importantly needs to be in tension. The part of the buckle (with teeth) that grips the belt end is below the pivot pin with the handle part of the buckle above and this creates a sort of over centre cam action. Pulling on the belt closes it tighter and tighter.
Putting one pass of the belt rather than two through the slots in the buckle will create less bulk (that's what I do) but I think you just need to press hard and pull the belt tight. Bound to work as it's so simple.
Dave
PS what's the diving like in Japan or are you going home down under to dive?
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