Sub, box and amp question

Hi everyone. I'm new here but been doing some research for my audio setup. I think I might have messed up. So here is the deal. I bought 2 wetsounds xs12 subwoofers. They are 500w rms. and I bought 2 sealed sub boxes. Now I calculated the boxes and they are 1.3 air space and wetsounds recommends 1.1. Are they not going to sound good in those boxes? Also I was on a budget so bought the best amp I could. I bought a Rockford fosgate r1200-1d. I bought the Amp first thinking I could wire the subs down to 1ohm. I just found out my subs are svc and will only do 2ohms together. So that means 900w rms. so will I be under powering my subs? Or will my setup still sound good? I'm stressing that I bought all this stuff that might not work together well.