For ?-8, 1 or 2 slow squads (speed <500) in top camp and some much faster squads (speeds over 700) in the bottom camp seems to work best for me. Supposedly, placing all on the top camp is better. But in that case, you're not guaranteed that they'll even enter the farming loop, and when even 1 fast squad from the top camp runs straight to the flag, then you're guaranteed to get very few trophies.
Generally, I end up with a slow squad from the top and a fast squad from the bottom tent racing eachother on the last leg for the flag, so that avarages out pretty nicely.