If you're going to make a pretense of scholarship, at the very least check a Strong's concordance. In all those instances of "kiss of love" or "kiss of peace," the Greek indicates phileo (brotherly affection) or agape, fully defined by Paul as an ethereal, pure, non-erotic love.
You might check the Scriptures (with a concordance perhaps) - if you are going to make a pretense of scholarship.
I don't think you'll find ANY instances of "kiss of peace" and only one (I Peter 5:14) "kiss of love" (or "charity").
As to "agape" being fully defined by Paul in the manner you indicate, of course it is not once defined in that way. Perhaps you think overall that is the definition he gives to it, but I think that is your construction. Just as you say Paul put a Holy Spirit spin on it (or might have, I am not quite sure which you are saying), so too he might have had a true understanding of spirituality being a very sexual thing. An understanding few Christians seem to have much noticed.
If he had that understanding, anything along those lines, there may be good reasons why he wanted that to remain fairly hidden. If one's soul is one's genitals (for instance), the use of the term "soul" instead may be because the more obvious (though clinical) term would be too contentious and the truly spiritually minded have to live with using the rather ill-defined, ostensibly ill defined (like "agape") term "soul" to talk about what they really want to talk about. I suspect there were cults of the time or before (I do not know for sure) who did use "eros" and hence to distance himself from them and other misunderstandings Paul did not use that term even once.
I am talking about a real kiss, and I would suggest so too is the Bible. The fact of the repetition suggests that, that it is not merely something PERFUNCTORY that one is being ADMONISHED to do. So it IS TOUCHING, and hence I think the claim is appropriate that it goes in the direction of loving. NOT SOMETHING ETHEREAL, but real for one's soul and mind and heart.
Actually, seems to me, little or nothing of the LOVE not only recommended but preached mightily in favor of in Scripture is ethereal.
"Pure" is another term one could discuss in relation to love; it would seem to be closely associated with "holy" which I would like to understand better. What IS a holy kiss, that is,
what would make a real kiss holy?