That seems like a lot of grain for a 5 gal batch. Consider something like this:
5 lbs 2-row
4 lbs white wheat malt
1 lbs flaked oats
With a 5 gal batch, post boil, and 70% efficiency, this gives an OG of 1.053, which is exactly what you want. You'll note that the lbs = the target % too, which makes this easy to remember.
I'd suggest that you mash between 152-154 for 60-90 min, boil for 60 min. One hop addition at 60 min to get 17.5 IBUs. Toss in 0.6 oz of fresh ground coriander at 10 min and 0.6 oz of dried sweet orange peel at 5 min. Ferment with 001, 1056 or 05 at 67F and you're there.