He uses DW20 -> no GregTech -> no Scaffolding nerf.
In a GT environment just use a sawmill for maximizing gain. I haven't done the math, if the TE sawmill or the GT sawmill would produce more EU, when all the energy used for intermediate steps has been substracted.
Bonus for TE sawmill + powered furnace (for the charcoal): cheaper to build.
Bonus for GT sawmill: Uses EU which is produced here.