I have the same hardware as you've listed and share the same frustration. Not only do you need multiple programs, but they all seem to be rather buggy and suffer from feature creep.

I need iCue for the keyboard macros, and it can also control the rgb on my motherboard and Asus graphics card. Promising, until you realize it can't control the ram rgb (probably because they want you to buy Corsair ram). So I need Asus Armory Crate for that. To top it all off I have an NZXT cooler so I "need" NZXT Cam too!

Not sure if this is the best way, but here's how I do it: I let Asus Armory Crate control the motherboard, ram and graphics card rgb, and use iCue for the keyboard only. I don't have any Gskill software installed. Of course I also have NZXT Cam running for the cooler, but it seems you don't need that.

Armory Crate gave me a lot of headaches (wrong colours, no animation etc) until I read a tip suggesting turning off "Enable Plugins" in iCue settings. Apparently this stops iCue from fighting with Armory Crate over the rgb settings. Make sure you check for this. Armory Crate seems to do a much better job after turning that off, although it still gets the rgb animation speed wrong most of the time.

None of this software has made my system unstable (apart from wonky rgb lighting), but running them does steal resources and makes start-up slower. I suppose it's a choice between top performance or pretty lights. Gamers Nexus had a video on Youtube where they tested this iirc. You might want to check it out.

Hope this situation will improve and some standard for rgb control will emerge, but I'm not holding my breath.