@htaytobrewing he scaled back the gravity, not the size of the recipe.
I wouldn't change the late hop additions (I wouldn't touch the 10min either). However, I would up the mash temp quite a bit. That beer went 1.092 to 1.017 (82% AA). If you get the same %AA on a 1.051 beer, you are looking at 1.009 or so. If I were doing this, I would bump the mash temp up to 156 or 157 to try to shoot for a FG of 1.013-15. I think a single digit FG is going to taste thin, however YMMV.