HCA:
Unequaled speed,
designed to properly launch Speed Pro Carbon Arrows.
The dual cam version has 5 3/8" brace. Nowhere did I see IBO referred to. In the article, or by HCA. HCA doesn't even put a speed rating on the specs list, just "Unequaled speed". So it's not IBO specs. Where did you read "IBO specs". How about a link showing 370 IBO. It's not "nocking" (sic), it's fact. The Speed Pro arrows are way under IBO weight. I'm not saying the bow won't do 370. It just won't do it at IBO specs.
BTW, an Extreme VFT shot 417 (or something like that) at the ATA show using a Speed Pro arrow.