If you're using it for bittering, any bittering hop without a strong character of its own should work. The most common bittering hop in the US for mainstream lagers is, I think, still Galena. So that might be on the list.
This is a good time to remember that the myth of low cohumulone being smoother is a myth. Cohumulone is 50% more efficiently utilized (isomerized) than humulone. So you will use less weight of high CoH hops at the same % total alpha to get a given amount of iso-alpha in your beer.* This means less total hop material, thus reducing the amount of all the other bittering and astringent substances in hops (remember, a minor but significant portion of hop bitterness is from stuff other than alpha acids.) Same reason you want high total alpha. There is no qualitative difference in the bitterness from humulone and cohumulone, but the other substances are harsher.
Given this, Herkules ought to be milder than Magnum, and I've read -- from Stan Hieronymus -- that it is.
So I wouldn't get hung up on looking for a chemical analysis that fits a certain profile, just read descriptions of the flavor and aroma and find one that sounds like what you're after. My $0.02.
*To compare the relative bittering power of two hops with different CoH levels, and adjust the amount of one to give the same amount of iso-alpha as another, you can use this formula: Bittering Power = Total Alpha * (1 + (%CoH/2))