Yea that sounds OK. I ususally allow for a bit higher AFR's (read 12-high 12) in the zero to lower boost portion (0~8ish psi) and then slowly lower them as boost increases (up to 20psi). It really depends on the motor too. I mean my car likes it a bit leaner, where as some other engines prefer pig rich. Play with it until you find max power, you will probablly need some dyno time. good luck!