Set it up to have the idle and low load and RPM points leaner than stoichiometric (14.7) otherwise you'll coke up your plugs a treat and unless you have a fine sand blaster to hand you'll go through plugs like no tomorrow! (im talking from experience!!!)
As was previously said, 9 is too rich, 10 on boost is still conservatively rich!
Its all a game of trial and error really.
Are you running a standard map on the ECU and then playing with fuel pressure to get lambda right?! If so then you'll never get the best of both worlds if your running more boost.