With spiced beers, I try to add part of the spices to the end of the boil & part post-fermentation. Jamil has mentioned getting different flavors from the spices depending on when/how they are added.
If I were you, I'd add 1/3 of the spices you plan on using at the end of the boil & use your tincture post-fermentation to get the level of spice that you prefer.
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