I have the 6' version of the same light, but with 14000k Aquaconnects. I never turn on my Actinics unless its just to show off the corals' glow to visiting friends.
I think if you're wanting to add more "useable" light, then switching out to 10000k PCs would be fine. Not sure how much extra growth you'll get though since bowfronts are deep & PC lighting doesn't penetrate well, compared to MH.
Maybe replace 2 & see how you like it.
Anthony
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