Spectrum to add to setup. 4k or 5k?

I want to add another Cob to my setup. I have it narrowed down to a Luminus CXM22.

I currently have for my 4 x 4:

2 x 3000k Quantum Boards 288 v2 https://horticulturelightinggroup.com/products/qb288-v2-quantum-board
2 x 3000k Growmau5 Pucks with 660nm Reds https://www.rapidled.com/chilled-logic-100w-puck-v2/
1 x 4000k Vero 29 https://www.rapidled.com/vero29se-4000k-80-cri-d-poke-in/

So my spectrum is currently dominated by mostly 3k with a bit of 4k and 660nm red.

Should I add a 4k or 5k cob or something else to this setup for the best spectrum for my plants?

thanks brothers heres a pic of one of my girls for your time

Your only problem is it's only going to change the spectrum over an 18" x 18" max of your grow area.
Maybe you could go down the uv road?
A couple of uv floro tubes would give a better spread
I use different spectrums over the plants.
I've a 3000k QB v1 over one plant and a Growgreen 3000k/5000k over another.
Growgreen plant looks better but is it?
Or is it the spectrum fooling my eyes...?

Whatever works for you, that's the main thing.