When you tune, don't aim for "lean" you will end up with peak numbers, you want the car to allow timing to remain consistent so at times, actually running it "slightly" rich will not give you the peak numbers but it will give you an increase overall.
Of course, don't run it too rich...you want your a/f ratios to be a few points under "lean"
Also, if your car tends to pick up power at any point try actually adding a little fuel in that area instead of leaning it. You'll find that your timing will actually remain consistent VS getting that peak and then having the car pull timing to redline.
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Chris 
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon
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