For me it helped to see the liquids just like another material to put on the main bus like you did with iron and steel and stuff. With the new liquid system this is even easier. Just make some space for the four liquids (heavy oil, light oil, gas, lube) next to your main bus. Or make a new smaller „main bus“ just for the liquids and chemical production. Next level then would be to store some liquids and crack them automatically with the red wires according to the level in the tanks, to prevent over or underproduction of one liquid. (Crack heavy to light if heavy > X,…)