I think you have basically described the sound of the Delos. I have heard the exact same characteristic on my Kuzma 4P9. I would keep the SME and consider going up the Lyra line to one of their lambda series cartridges (Etna or Atlas) instead of investing in another tonearm for your Delos.
Looking for people who had heard both the Kuzma 4point 9 and the SME V...
I have an SME V paired with Lyra Delos...I like the combo it's super fast and get deep bass...imaging is phenomenal...I do however feel like its always fast and forward and maybe just a bit lean in the mids?? It's an older SME and am kicking the tires on a rewire or new cable..but before I go that route...I was thinking of trying the Kuzma 4 point 9" version...I have used and enjoy unipivots; the kuzma sounds kinda like a best of the gimbal and unipoivot world...Anyone have experience with both of these arms???