Well, what I see is that layered buffs readily push character checks above the range of difficulty classes. Above "nearly impossible" - which can become fairly likely. It feels like a design disconnect. A flat +1 shifts the range in an uninteresting way.True, I suppose I mean more that I would prefer feedback from the OP on our stances and suggestions before I bother investing anymore time and effort into it. Also, I certainly didn't want this this to become a "what is significant and what is not" debate since it is ultimately a matter of opinion.
When it comes to stances and suggestions, any it's-fine-as-is responses are kind of unhelpful, seeing as they don't advance the discussion. Maybe it is fine for such posters, but not for me. So they add nothing to the discussion. Better is where someone says something like, it is fine if you do X, have you tried that?
I find it most valuable to see other people's takes on how they play it at their table, where they have tweaked the cantrip.