As an owner of the K1x and former owner of the V5Xe, I would say that combination can be to much of a good thing even with warm speakers such as Maggies. I personally found the K1x to be the best darn piece of gear I've ever bought. I never thought that much of the V5Xe. I got the sound you are describing with it. I ultimately chose to use the Parasound JC-1 mono amps with the K1x. This combo is detailed and lively but not to much so.
I'm no expert but it seems like all your electronics and speakers are all thought to be not thought of as warm sounding. So maybe you should try something else that is thought to be more of what you are looking for.
If you are thinking of an upgrade to the K1x I'd say go for it, it's a great piece of gear and even if it doesn't get you the warmer sound you are looking for I think you'd love it. It will be a solid building block for whatever your system evolves to in the future. I'd never get rid of mine unless I was getting the KXR.
I'm no expert but it seems like all your electronics and speakers are all thought to be not thought of as warm sounding. So maybe you should try something else that is thought to be more of what you are looking for.
If you are thinking of an upgrade to the K1x I'd say go for it, it's a great piece of gear and even if it doesn't get you the warmer sound you are looking for I think you'd love it. It will be a solid building block for whatever your system evolves to in the future. I'd never get rid of mine unless I was getting the KXR.