I’ve run KB 4 and new Primal in a stack with LB. I was running LB and KB 4 same day. If I were to do it again I’d try Primal LB on the same day. KB 4 was for me pretty dense and healing. So from my experience, looking at your stack seems daunting. SB and Primal and KB4? To me that’d be a bit of a heavy load. But we’re all different and a title that might be “dense” for me might seem easy for another.
But as far as results I think that’d be a great stack actually. I’m planning to use KB 3 to stack with when I bring Primal back into the mix. I found KB 4 a force to be respected and so I’d only stack it with maybe LB and Sanguine, or Mind’s Eye, something light.