just an idea:
as you said you have 2 diffrent porpuses:
A) fuel;
B) ingredient in recipies.
a)
take the coal out of the process and maybe do 2 diffrent wood processing trees
one cokes wood to charcoal to coke, so you arent bind to the fixed coal-energie value.
you can fine balance the value to amount ratio by the processing act, making it much more rewarding and more difficult to creat enough amount to let the stuff run.
b:
you can make it much more cost intensiv to create pure coal for the recipes (sulfur...)
cokeing wood directly into the coal, so you can use it for other purposes instead of burning it into the air.
this gives you the freedom to create a high ratio for energie reward through processing, bu decreasing the amount.
like you said, coking wood into charcoal leaves you with less volume, but with much more energie inside this volume.
the decreased volume can be showen through less bigger numbers of charcoal/cokes i have after coking the wood.
this would hugly balance you awesome mode and make it much more rewarding to create a sweet little treefarm, without the nagging feel of having something too powerfull
![Very Happy :D](./images/smilies/icon_e_biggrin.gif)
you also can twitch a bit on the coking times you need to get new better full. maybe giving the oppertunity to create larger (more rewarding) amounts over a longer periode, or smaller but faster amounts.
for example:
small load: 5 wood 20 mj --> to 1 charcoal with 25 mj (maybe 2x so 10 to 2)
big load: 100 wood 400mj --> to 25 charcoal with 625 mj
this makes it harder to get enough wood amount and the time to coke it, but its more rewarding.
to my 2nd suggestion splitting into multiple techs, you could make the charcoal already possible to coke inside the normal stone ovens, with an awefully slow progression.
and put you highly cool ultra oven as reward to the last research. so the charcoal creating is the first possible research (maybe even putting the treafarm mk1 before) with only red.
coke creating is after advanced processing and the last step the modern ovens to make bigger amounts faster
![Very Happy :D](./images/smilies/icon_e_biggrin.gif)
3rd suggestion:
i didnt mean the biolap, i mean the liquid air. it doesnt make nitrogen harder to create, just 2 biolaps side by side, finished.
same goes for the phosphate/potassium. both uses the same ingrediens, so i can feed them with the same 2 belts.
if you want it harder to make, maybe use some more valued mats, like coal or oil. yeah you can give this useless heavy or light oil some porpuse ;D
greetings
Daassan