I love how you ignore the facts that others say so you can make up negative information about a product that you don't get for free. You really are a special level of scumbag.
Just be thorough when you take it apart and check everything on the way down. I'd send the VB to Suncoast to be tested. Right now you're at the point where the only person that can really help is whoever tears it apart.
In my opinion they would spool faster for comparable air flow. I'm no expert and I'd love to hear from some people who have gone from compound twins to triples.