very cool man. nice clip. yes i have done tons of experiementing on stacking two OD pedals, not for the intention added for gain purposes but to try to capture a best of both worlds scenario. For instance, Im a huge fan of the grey DOD overdrive 250 pedal for the transparency and single note lead playing, however a tube screamer type pedal is essential to me for some compressed chunkety chunk rhythm mid-hump cutting through the mix sorta thing. with the right balance of levels and gain, i can achieve pretty killer results with these two in combo. The Fulltone FatBoost-3 also works well as substitute for the DOD which i only use the level control on and gain at zero.
BOSS-SD1/TS-9 is a great combo for 80's metal rock tones through a stock Marshall. ..again balancing out the levels. i have an EP-3 and im gonna try your approach as well.