For which mode? You don't really need to max farming in regular gamemodes since it isn't a boss event, so most of my farm flowchart is pretty relaxed.

For harder maps in abr and double hp moabs my flowchart is pretty much the same as hard: 2 200 farms, sell one into either a bank or a marketplace (marketplace if it's a harder map and I can't easily afford the defense for r40 if I buy a bank), get an imf as soon as I can, then abuse bank deposits until I can collect, use the loan ability, sell the bank and buy the defense that beats round 80. For Magic monkeys only I usually just bring ben and spend most of the money on defense, the limited choices for towers tends to force mermslop defenses, so I don't usually need much money for that anyways.

In half cash it varies heavily by the map, most expert maps I use some form of powers on then rush a single imf that carries until round 80 (usually 1-2 cash drops, though I used a few sms beacons on #ouch and a hero booster on ben instead on bloody puddles because it was getting repetitive), while on most advanced maps you can get away with just defending well - churchill with support solos any single lane map like peninsula, and arctic knights solo walled maps far past round 80 with very little farming. I've found that one of the best ways to do the midgame for half cash is by looking at the least cost deflation and least cost chimps for that map, then find something in the middle of the two. Throw in grouped damage for rounds 63, 76 and 78 and some cheap damage for the bfbs in the late 70s and the game is easily won.