Yes basically, you mentioned the 4000K being too yellow/green so that’s above the BBL, mesured with delta uv (duv), when duv>0 it’s green/yellow tinted, with duv<0 it’s magenta tinted, ”rosy”.
See my post about LH351D slicing, or any review by maukka with CIE diagram (the diagram with the BBL on it).
4000K LH351Ds, even with a bin like T6 or T7 generally aren’t great, but 3500K seems to be bit better in general, contactcr tested some Here , I wanted to test the 3500K ones from Convoy but haven’t made an order yet.
Slicing improve the tint if you’re willing to try that, it will also make it look closer to your XP-L HI in term of throw, low angular tint shift (uniform beam color)and CCT but with high CRI.