This is just a guess but the 2 days off is to keep your receptors from desensitizing, but I really think you would be adding a diff compound that stimulates similar receptors and I think it would just be overkill. I'm not saying its a sh1t idea I just think that with a lot of diff gear in general most ppl super max out the bodies potential but with half the gear and proper administration you will get 90% of the same result if you just dose everything under the sun.
My 2 cents