The thing is, HHC is not a typical product of distillation, heating in air, mixing in terpenes, or any other common operation. Isomers of THC are common products of improper treatment, as is CBN, but not HHC. The saturation reaction requires hydrogen gas and usually a metal catalyst, so you cannot assume it is a product.
If all you did was mix in terpenes with heating in air, it is perfectly reasonable to see lower cannabinoid numbers by simple dilution of the distillate with terpenes, and higher CBN due to the heating in air. I figured that was completely obvious, though.