Thanks, Bristol, for explaining that to me.
 
Hopefully it's not my ears.   That would not be good.
 
I have been working on several songs over the past few years (I'm slow).   Listening to the songs where I used the mudguard, the vocals seem fine.  But the songs without the mudguard are the ones with the issue.  So maybe that's all it is.  I really hope so, anyway.
 
Thanks, everyone!
Greg

Forgive the possibly obvious question, but if you record something besides vocals, does it also sound mid-rangy?

No, everything else sounds fine.  It's just vocals.  So perhaps it is the room.
 
Thanks!
Greg

Just get your Mudguard back.

pinguinotuerto
Just get your Mudguard back.

greg54

pinguinotuerto
Just get your Mudguard back.

UPDATE:   It seems the mudguard was the issue - or lack of the mudguard.   I guess I have really bad acoustics in my room.   The mudguard definitely helps.
 
Thanks, everyone!
Greg

greg54
UPDATE:   It seems the mudguard was the issue - or lack of the mudguard.   I guess I have really bad acoustics in my room.   The mudguard definitely helps.
 
Thanks, everyone!
Greg

Told you to get it back! 

As for spectrogram graphs there are iPhone apps that work pretty good.  I use the free Oxford Wave Research app. I take it to live gigs to figure out the room.
 
On my computer I open the track in a wave editor which all contain spectral analysis. It should be part of everyone's Mastering  routine. Your ears can lie to you so a visual will confirm what your hearing.

It sounds to me like you're simply expecting a dynamic mic to sound like a large diaphragm condenser, and the mudguard helps a little in that respect. More power to it. But I wouldn't instantly blame the room, a dynamic mic will usually have more mid and less top and sub than a large diaphragm condenser no matter what room it is in. Room acoustics should play a relatively small role if you're using a dynamic mic and singing close to it.