Joined: Aug 2010
Posts: 12,727
Likes: 2,105
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
If your punctures are from road debris getting through the tire, such as small wires or glass or thorns or nails, the plus might help a lot.
But if your punctures are pinch flats (or snake bite punctures) from hitting the edge of a pot hole at speed, the plus with a stiffer tire might help some but higher air pressure might do the trick too.
What kinds of punctures do you get?