Seems inline with my understanding of this.
I have added up to 30% new rock to a system without any visible effects.
Add the live rock as you've described and you might see a small cycle but nothing detrimental to a system.
You might want to consider adding the initial 10% to your tank and then taking the rest of your dry rock and seeding it with a little rock from your established tank in a tupperware container or something and then slowly adding the rock in small intervals from the tupperware...
This will probably lessen the cycle and also speed up your overall time to maturation.
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