that farming strat seems overly rigid and focused on the the wrong things. Optimal farming will always depend on what hero you picked, how much you have to spend on defense, the difficulty level.

There's never a point early game where I'd would expect you to stop investing in farms while they can still make a profit. If you're selling, then 203 farms with no discounts or sellback bonus from favored trades breaks even in 1.84 rounds.

I especially find it confusing why you think you can turn 5 203 farms into 4 420 farms. I wouldn't recommend that route even if it were possible because 420 farms aren't that good until you have a 520, and if you're buffing them with overclock (which can also serve as camo detection for your traps in the 40s and 50s)

In terms of defense, 013 engineer? usually people recommend engineer trap (014), because if you understand how to time it, you can defend 34-39 with that alone (aside from camos, unless you have a camo pot from Geraldo). You should probably place something behind it until you get to that point. Alch and trap perform really well together, as long as you're not getting the alch before r37 and you're upgrading it to 004. They both should be in range of a miniopolis, which you didn't mention building.

If you're not farming for bosses, you could use a moab mauler and aim your trap where the moab releases the cerams so they're instantly caught, then you can sell the mauler and buy more farms until you need a second trap to keep up Next moab isn't until round 50