I 2nd this. Marcelo is the man to emulate.
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I enjoy the over/under from butterfly, as well as marcelo's basic nogi sweeps. However, the power of the 2on1 butterfly is HULK LIKE! I only us the over/under as a transition point now to flow between half guard and rubber guard. The 2on1 is a money sweep. Its the mechanic of the butterfly :)
So I looked up the 2 on 1 sweep. It looks like he falls more on his back than to his side, is that correct?
Well as this being my go to guard and me being relatively new and unexperienced what helped me was the basics, if someones aggressively coming forward plant your feet on their hips to stop them from going forward and keep them at bay, if you have a two on one then if he comes forward you can sweep to take the back. Personally i prefer having head and an arm on the tricep, Marcelo sweeps all the time from here, you can bait them into an omoplata/jiuclaw as well. I found that it was all about me controlling the distance and space, if i feel like I'm uncomfortable then i back out and try to establish a grip. Personally i dont use underhooks because guys just t-rex and its a battle just to establish it. When in close under/over hooks. Mid-long distance head and arm and 2 on 1. All pretty basic but it works for me!