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My answer will depend on how you are driving them, additional 12 all on one string, or multiple strings?
...and how you have the two strings now running all on 100% or whites and blues dimmed to different levels (if so what levels for each channel are they set at?)
If all on one string I'd I'd add 8 violets (either 420nm or 430nm, just pick one or the other) and 4 true blues (480nm) I would also consider replacing the 3 central CW with a high CRI warm white such as the Luxeon Rebel ES 2700K (model. LXW9-PW27. That 9 in the model number is important to get some of the far red that is missing from a white and blue only setup such as yours without going as far as to add actual red leds)
Avoid green, cyans, and reds unless you are going to dim each separately and are prepared to have some disco effect (or use 3up chips which triples the cost)
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