I run only 3500k in flower right now and its working just fine. When we are new at this(I still consider myself new with DIY LED) its easy to get caught up in "overdesign", splitting hairs over efficiency and spectrum. You bought some good gear, that will produce plenty of good flowers. Lighting, in my belief, is one of the least important variables in smaller scale cultivation, provided you generate enough photons in that area. The kits you mentioned will produce a generous amount of said photons.
Hook em up, get the conditions where they need to be, watch them produce....