Where are you getting Midare costing 60 kenki? It costs absolutely no Kenki to cast.
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Ah, yes... I realized that afterward. Hagakure is on a 40 second cool down and it's often used to reset Sen when when mechanics mess up your buffs, so it won't always be available.
If Hagakure is up and you use it on 3 sen, it's a slight damage buff. If it's on cool down, Midare wins by a long shot.
Hagakure vs Midare should be looked at as an opportunity cost/gain in a situation where you have 3 sen + haga available if you are able to dump all sen generated into shinten plus gain a GCD the gains will be greater then using the 3 sen to midare and using haga on anything less then 3 sen or putting it off until next available 3 sen (8gcds later)