Lower Hydration to Compensate for Additiions

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I baked Hamelman's Workday 100% Whole Wheat 

https://drive.google.com/file/d/1Bl0cmWlncKQtAQw4bUby0Kh43wnb5m0k/view?usp=drive_link

with the addition of 100g of whole (shelled) walnuts every other week for me wife.  Since I switched from King Arthur Whole Wheat to King Arthur Golden Whole Wheat (which is slightly lower in protein but we agree that it has a better flavor), the loaves really spread in the oven.  

Workday 100% Whole Wheat 2025-09-15 Photos

It finally dawned on me that maybe I can fix the spreading by reducing the hydration from the formula's 80% to 70-75%, at the cost of a tighter crumb (part of the cost of walnuts).  

Any thoughts on this?   70 or 75%?

Thanks