color temp is just one measurement and there are an infinite number of spectra that can create a given color temp
look at spectra of full sunlight, ~5500k
http://www.crslight.com/images/sun.jpg
look at spectra of a 5700K LED... its nothing at all like that
http://cobkits.com/wp-content/uploads/2017/06/1212-90-gen6-spectrum-1024x652.png
unless youre going to use some colors during veg and different ones during bloom, no point in that. they are all the same tech with different thicknesses of phosphor. for a given CRI if you take 3000k, 3500k, and 4000k and can uniformly mix them, the result is... 3500k more or less
pick a spectrum and use it, and it will be more uniform