I don't know what Ing and Ing 2 add to a given recipe. I do know that Innovation adds more than an additional stack of IQ would to your final Byregot's.
Innovation is 50% of your base (starting) Control. IQ is worth 20% per stack, of your base (starting) Control; and also increases BB's Efficiency. That Efficiency increase is why Innovation is worth less than 2.5 IQ stacks; but that Efficiency increase does not bring Innovation down to merely 1 IQ stack.