Glad to hear this has worked for you. I've been looking for a grain bill to do single hop pale ales and I'm leaning towards this one (mainly since my bulk grains are pilsner and maris otter). The one big change I'm probably going to make is to move the flavor addition from 30 minutes to 15 and do a FWH instead of adding at 90 minutes.
On all of your single hop beers, do you keep the dry hop at 2oz?
I use this grain bill for most, but not all, of my single hop beers that I currently do. It works really well. I've also reduced it to a 60 minute boil, and I could not distinguish anything different from when I used to do it for 90 minutes.
I think you'll be fine moving around the hop additions, but you're going to produce a different beer overall. I took the "if it ain't broke, don't fix it approach," so I stick with the same hop additions, and shoot for about 25 on my first addition (60 mins) and 20 on my second (30 mins), and I've got good results. I always use 28 grams at flame ounce, but I dry hop a little differently than the original recipe. It calls for 56 grams for 10 days, but I do 68 grams for 5 days.
This has all worked out really well for me, so I continue to repeat the procedure, but I encourage you to change the recipe to something you think sounds good and give it a shot.