The spacing looks fine to me. I personally would run a combo of royal blue and blue. It will add a wider range of color spectrums and the color difference may not sound like much between the two different LEDs, but it is noticeable. The LED ratio looks good, just remember to adjust the max output current on the eln-60-48d drivers for the blue/royal blue LEDs. The driver has a max output current of 1300mA and the XPE LEDs have a max current of 1000mA. The XPG cool whites will be fine with the drivers still set to a max of 1300mA because they can handle 1500mA.