I'm going to say str is unimportant for a cleric, sure you'll be weighed down with your junk, it just means you'll have to manage your stuff better
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Yes you will max wis eventually, and probably quite easily, so maybe putting in a small amount of wis early on won't pay dividends later on. Stamina, like people have said, is difficult to max, especially given that old world pieces don't really have your wis stat + sta on it. So might be worth that.