Add Minute Nine Studios to your list of mic modders. He can do an $80 electronics mod on the Rode and/or the V67g to take the hashy edge off the highs. He might be able to do the same on the other MXL you mentioned, although that mic is so cheap, it might benefit from more extensive modding.
I have a V67g modded by JJ Audio with a U87 circuit and new European capsule. It's my go-to mic for male vocals in the C&W and folk genres. It's big and beefy without much of a push in the high end. Even the Minute Nine Studios mod has that big beefy U87 sound. Check the before and after sound clips on the "testimonials" page of his website.
I have a modded MK319. The mod opens up the high end. I don't use it much, but that could be a personal preference. To my ear it's more of a problem solver mic than an all-arounder. I'll put it on a bright guitar or other source that's lacking in midrange. I still haven't found a voice it sounds great on, but others have. The midrange push can sound really honky on a "normal" singer.
The NT1a is rumored to be exceedingly bright, which does have its place in pop music. A dark guitar can generally benefit from a bright mic. Same thing for singers with muffled sounding voices. Since both your NT1a and MXL4000 are bright, you might consider doing the budget electronics mod on one, (so that it stays bright, but in a smooth way) and a more extensive mod on the other. In other words, if you were to re-voice both mics with a "mid-focused" capsule, you'd end up with no bright mic to use when you really need it.
"You're either with a native DAW, or you're with the terrorists." G.W. Busch Lite