Laser resurfacing: I have not had the results I am looking for.

Hi. I've had co2 fractional laser twice. The first time the strength was 60 microns (30 each pass) and the second time I did 40 (first pass) 30 (2nd) and then a third pass at a reduced strength ( not sure on that one). However, I have not had the results I am looking for. My question is, how can I get my skin almost completely clear? I have very few brown spots but I'm still not happy with the unevenness on the tone. Anybody have a solution?