First off, because of hardware issues I haven't been able to play the most recent experimental versions, so sorry if any of these have already been implemented or conflict with anything already in-game.
Coalfuel should be changed to a liquid, like biogas, and be given a new method of processing.
I suggest that the first few steps remain the same, apply water to a pile of coal dust either manually or with the canner's enrich option, compress it, then put it back into the canner for another water processing step to make coalfuel. Alternatively, it could produce wet coal, which is then put into the fermenter to yield coalfuel.
An alternative processing method, which can either be added in addition to the above or as the sole way of making coalfuel, could be to make the second enrichment use biogas instead of water, with coal acting as an additive. If this is made into the only option, I would also propose a renaming to coal-diesel.
Obviously, this should provide more energy then burning the biogas directly, and if it's added as an alternative to water then it should yield more energy-profit per coal to compensate for the greater complexity and resource cost. (Even if those additional resources are renewable)
Also, with the addition of the blast furnace for making refined iron, it seems like an obvious way to add a more interesting progression as well as nicely integrating the blast furnace into overall progression by making all of the electric tools require refined iron to craft instead of just iron. Besides, it would make sense that an unbreakable, if electric-powered, tool in a world with otherwise rather frail tools would require some kind of advanced and artificial material.
As a minor suggestion, I also think that the diamond drill should have an advanced circuit added to its recipe, to make it at least slightly less of a no-brainer to upgrade your drill immediately. Plus, it makes sense that an advanced tool would require an advanced circuit.