If the wheel keeps on failing - for some unidentified reason - you have to review the variables: 
  - the rim 
  - the hub 
  - the spokes
  - the construction 

From your description it's probably not the rim and, like @Daniel says, 'burrs on the hub' sounds like some fake techno-jargon you're being fobbed off with. 

It certainly sounds like the spokes are failing to do the job the wheel builder is expecting of them. I'm a similar size and when I had some wheels made recently the builder used tandem spokes for their extra strength. Every little helps. 

That said, it sounds like, unless you've a particular reason to keep with them, finding another shop might keep you safe and sane - and a second opinion is rarely a bad thing in this sort of situation. 

Spokes keep breaking - bad hub or bad build?
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