Personally, I wouldn't use 151 proof for tincture, but some people do, but I have no experience with it.
Instead, I'd just make whole herb edibles:
(1) Decarb @ 240 F for 40 min
(2) Grind to fine powder
(3) Mix into the recipe oil of any cookie, muffin, or brownie mix.
(3) Bake and eat. Each gram herb used will supply about 150 mg thc to an edible.
I make min-muffin sized brownies, muffins, and cookies because they can be baked for less time, and heat does reduce potency.
Chewing edibles does cause some sublingual absorption, so there are small tincture effects too.
Mixing decarbed herb powder into nut butter or nutella also produces a quick potent edible.