It's partial self-control. You recognize the problem, yet you still depend on someone external to make a chance because you aren't strong-willed enough to make it yourself.
Different means to the same end. He is just compensating with amazing self consciousness which is the foundation.

And also Unlimited Willpower happens because of circumstances. Not everyone is going through the same circumstances.
 
This information most likely explains why Tashigi looks so much like Kuina.
Tashigi is also descended from one of the Shimotsuki whom left Wano with Kozaburo.
Her parents are likely among the 15 individuals that decided not to settle at the village.
Shimotsuki Tashigi.

(copy&paste)
So there's a chance kuina mom and tashigi mom are twin?
 
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