There are a number of companies that make (or used to make) a "Hot Rod" VP-44 that increases fuel delivery. I don't know if this is what you mean by "over built. " The only ways to really increase VP reliability is a constant fuel pressure supplied by the lift pump (or FASS, or RASP, or whatever) and cool fuel to cool the internal electronics in the VP. There was a thread recently on TDR regarding a fuel cooler. You might want to check it out.