Dip 'n Grow is 1.0% IBA and .5 % NAA, which is another auxin. 1.0% IBA is indeed very powerful (that's 10 times the concentration of the Green Light stuff, for reference), and the addition of NAA probably doesn't hurt.
If you really wanted to, you could make your own dip 'n grow (or any higher concentration) by dissolving Green Light in alcohol (IBA isn't water soluble) and then adding SUPERthrive, which is .09% B1 and .48% NAA (I just pull this stuff straight off the labels, by the way). Some/too much math required. IBA occurs naturally, while NAA is a synthetic hormone, if that matters to anybody. Both are supposedly hazardous to your health and the environment, so be careful when handling, clean up and don't inhale the stuff, especially the higher concentration stuff.
All that said, if you're getting 95%-100% rates out of the .1% concentration stuff (as almost all of us are & should be), there's really is no reason to pay more for a higher concentration, to get the same results. The .8% and 1% solutions are intended for the most woody trees and shit like bamboo, you really should never need anything that strong for a MJ plant. If you've got a particular strain that won't clone, under known conditions, while everything else around it roots, that's only when you should look into the higher concentrations IMO, even though your first thought may be "if .1% is good, than 1% is better!". These are toxic acids after all. Sometimes more is not always better.