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A/F is ok high 11's, could be a little straighter but W/E. I agree you're numbers are a bit too weak but I never dealt with an M-90 on these engines before.
Take a look at the AFR from 4500-5500, compare the HP and torque over the same interval and ask yourself if you really think it should be leaned out.
Peak numbers aside, I don't think you could ask for much better looking torque and HP curves. I wouldn't say your tune is "too safe", but it favors the conservative rather than the aggressive.
I thought M90 didn't make as much as a twin screw or TVS at the same boost level anyway. Drive it and be happy!
M-90's don't make the power, it's very anemic blower for a 4.6L but with a set of Hot Rods, you'd think he would make a bit more power then this. Oh Well.
For that blower those numbers are great. Can't expect a much better a/f line than that. I'd be pretty happy if I were you. Most M90 owners would kill for numbers like that.