With that many lumens the plants will grow, but thats just the tip of there potential. And lumens don't add up like you would hope, so the two that put out 1600 each, together will only put out 1600, its the intensity that matters, not the number. so if you brightest light puts out 2325, thats the most lumens you'll have. theres, a thread on here that show the proof behind it.
so i hate to say it but you probably only have 2325 lumens in there. but thats doesn't mean pull the others out, they help spread the intensity, not increase it.