If you aren't trying to bulk, but only gain strength, you don't need much of a surplus, especially in fat. Your body's fat stores will be used for sustenance as they break down. Spike your insulin to put nutrients and glycogen back into your muscles, but I don't see any reason for much of a surplus.
Lean Gains is designed for those who are trying to drop the last few pounds without losing muscle. It works for dropping more weight, but you have more room to play with a lower or non-existent surplus.