What do you want your vocal mic to record?

I'd bet dollars to dimes It's not the mic, it's ur room, those freqs have power and punch, they excite and build in spaces like yours very easily, extend a mic cable down to ur piano area and try to blow my bet up?

I had a casual conversation with a neighbor yesterday who's an AE, and has a dozen high end mics. I mentioned I still wasn't happy with the sound I'm getting, and he said, you know, once you get to that quality level, you're gonna hear the room, and after seeing Tony's post, I think he has a point. he said just try a 58 in a crappy room, you'll be surprised. Part of my issue is I'm also compressing the 4hit outta stuff to get some energy and volume, so the flaws in the vocal are also highlighted.

Maybe I'll post a mix in a minute as an example..

I wrote and taught an acoustics course in collage for 3 years.
The human voice is predominatly in 100- 500 hz range.

I took and acoustics of music course in college - for one semester.

Anyway, though I would not disagree with your statement, I believe we all know it's because these are where the fundamentals and very first series of harmonics lie. Nevertheless, unless the fact that those frequencies, which are certainly louder than the higher harmonics that are so important to defining the subtleties of tone and character, somehow additionally masks them,  I don't see how it's relevant. A bump is a bump and a dip a dip.  If you hear it, you hear it.

im gonna try out my bigger entrance hall, but the thing is, I don't want to have to move anything out of my room. I want it to work the way I want it to in there.

not speaking for winetree, but i think he said that because it's where the vast majority of the freq energy lies in the human voice, fundamentals between 80 to 180hz on males, now put that in conjunction with the fact that predominant human hearing sensitivity exists in the exact same bands, and it's a recipe for caos(it's mistaken that 2-5k range is the strongest, it's the most sensitive to our ears, but not the most energetic, think about trying to listen in on a conversation happening across a room, all you hear is the 100-500hz murmur, no articulation in 1-5k region because those freq's don't have the energy to cut through atmosphere, and carry across the room).
   If a vocal is sung in a pinched environment/small room/bad acoustics that tend to aim reflections back at the mic, those 80 to 500hz freq's will easily show up as the strongest audible peaks on that mic, they will be heard to be loudest by a mic that is NOT subject to fletcher munson rules, then you play them back on monitors 3' away from your ears, and there they are!! it's all very confusing, i'm confused after writing this lol.

The hard reality is NO ONE hides from their room, it either shows up as it is, or shows up as your attempt to hide it, either way it's putting a big fingerprint on everything you record. So my 20 cents is.. either get it straightened out to the degree it does no harm, make it sound great, or find a great sounding room to be your recording home and be a really happy camper, all much easier said than done no doubt. 

I've found in the past that a mic isn't a problem with a great singer. Usually it's what's in front of the mic that gives you problems. I don't know how to fix that.

Often great singers have a completely different perspective of what their voice should sound like than the rest of us, sometimes finding that sound is a never ending quest!

Ike and Tina Turner being Exhibit A of your  theory.

Fair warning: NSFW

Even if your mic has what it takes, sometimes the preamp choice can obscure that.

Recently, I switched to a Dizengoff D4, ( a REDD 47 clone), and now I hear much more nuance and low level detail, with a bright, but smoother high end. So, the right preamp enabled me to hear what my mic's capable of.

As for the question, I want my mic to sound like this..