If you're going to add a swing out along with loading up the rear, I think it will definitely drop to your liking. I'm assuming you will add a jerry can, highlift jack, etc along with your spare tire. That stuff adds up. I would suggest keeping your coils now and assess your situation after you add everything you want. If you still think it's too high, just put those coils on the classified section and buy the ones you want. I know they will sell quickly.
When I installed my SS 1.2, the rear coils were not tall enough for my liking so I put them up for sale and got responses within the first hour. I ended up getting OEM 861's and never looked back.