Some good wisdom in your post . . . however, I take this a bit differently than you, most likely:
and to reason on a thing unknown is presumptuous and absurd;
I consider it presumptuous and absurd for hyper Calvinists to functionally obliterate the BOTH/ANDs of Scripture on such issues.
We don't know--certainly with any precision--how to resolve the SEEMING mutually exclusive FLAVORED Scriptural BOTH AND Scriptures on such a topic.
But it IS PRESUMPTUOUS AND ABSURD to therefore throw out all the uncomfortable ones via WHATEVER rationalization or 'slightl-of-hand-logic.'
"by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me." -- 1 Corinthians 15:10