If you're hitting that many GIR you're certainly going to have your share of lag putts from 25+ feet where there's basically no realistic shot of making the putt...
...that said, I think you should be making a few of the mid-length putts, whether they're helping you convert birdies or just save par. If you have a straight-up-the-hill 10-footer, that's actually a putt that should drop, or at least scare the hole and catch a lip.
It really depends on the difficulty of the putt but again, there should be a few that fall based on how many you're getting.
If your ball-striking is as good as it is, I do wonder if perhaps there's some work you can do to convert a few more with the putter. You shouldn't be thinking "2-putt" or "just lag it" from 10- or 15-feet unless it's the most extreme kind of downhill breaker.
If you're really a + index player, you're going to have enough chances at making those 10- and 15-footers that it matters. You want to get into the mindset of expecting to scare the hole each and every time from that distance. If you aren't making those, it's definitely a sign you're not really as accurate a putter as you think.
If I give you a straight 10-footer on the practice green...that should be dropping as a matter of course. You're going to get some make-able putts on the course for sure. You have to convert those opportunities when you can!
.