Target Thickness Calculations

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Hi All, I’ve been working the formula calculations, one from the Gore book the other from a ytube video. The results are similar. My question is which final thickness do I use . They both point to 2.1 mm - 2.9 mm as I change the index in one formula and the vibrational stiffness factor in the other. I’m building a classical guitar and at 2.1 mm not much room to graduate to the perimeter. The other question is since I’m not graduating is the Solera Doming enough ?
Thank you
Zef Guerra

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Here is the other file