Fair enough but have you considered an upgraded IC to keep your IAT lower and hopefully allowing a higher timing.
IMO lowering your boost to 7 or 8 may provide you with enough leeway to up the timing a notch as you'll then need "less" IC cooling for the same air charge plus your now higher fueling will help with lowering your IATs.
I have an S3 Intercooler so thats not a problem
To be honest 282bhp & 331lb/ft is enough
so im happy with the settings
Carl