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Any dyno tuner should be able to help you with the timing. Tune for best torque to make the engine live. Don't add timing to make HP, add boost. Always tune for best torque at any positive load points. Don't limit yourself with a pre-determined boost number. You will kill a motor faster with timing than with boost.

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Seems that peak torque timing on a turbo engine is for the most part the peak HP timing also..

You will lift the heads sooner with retarded timing and bigger boost than more aggressive timing at a couple lbs less. Stock blocks are very prone to this!

After tuning lots of efi forced induction vehicles on the chassis dyno you can make more power with less boost and better timing, than having your combustion not take place at the optimum time and adding boost to bandaid retarded timing.