Will fine tune adjustments with protractor help with "brightness?"

brightness and MM cartridges can be a function of the capacitance in the phono cables from turntable to preamp, vertical tracking angle, vertical tracking force and the cartridge characteristics and break-in.  it can also be affected by the alignment.  
you have the mofi ultratracker which is made by Audio Technica and has a microline stylus.  
AT MM carts can be bright sounding.  As long as it isn't distorted, it could be a characteristic of the cartridge.  
They are also sensitive to VTA.  If your VTA is "level" you can try lowering the arm a mm or two in half mm increments and listen closely.  
misalignment usually causes distortion, not necessarily brightness.  the technics gauge cause a slightly distorted sound for me- the mint tractor alignment eliminated the distortion.  you can estimate the mint alignment by pushing the stylus out from the overhang by about 2mm or so but still centered.  
also make sure your phono cables are as short and low capacitance as possible.  I use the low capacitance ART cables sold by KAB , 0.5 meter and never had a brightness issue with MM carts including the ortofon 2M black.  
lastly brightness can be a function of break-in hours on the suspension and stylus.  After ~ 200 hours or so the suspension weakens slightly allowing better bass and the stylus round off a little and sound smoother.  
good luck!  

One thing I learned as a physician, even though I spent most of my professional life doing research, is to listen carefully to the patient's description of his illness.  In this case, the OP is telling us that the character of the sound changes from bright to less bright, over the course of playing a single LP, from outer grooves to inner grooves.  To me, that does not sound like a problem that is primary to the cartridge. Albeit, some other cartridge might be more or less prone to produce the same phenomenon in the OP's current set-up. But first, I would look at alignment.

Years ago, I had a similar problem, only in reverse. That is, the high frequencies sounded more natural at the beginning of the album, and got a bit brighter as it approached the end of the lp. I too, am suspecting this might be coming from the cartridge itself. Not sure though. Like some other posters said, try lowering the tonearm in small increments, changing the VTA, and see what happens.

Excellent advice everyone. It's a possibility my ears do deceive me :)  I'm going to reset the cart at some time for another listen. I appreciate everyone's input as I'm only 3 months into my vinyl setup, so things are very new to me. The good thing is, I'm enjoying the sound a lot and enjoying putting together a nice collection of vinyl. 

Thanks!

@avanti1960 thanks for chiming in. I appreciate your input. I'm still considering the mint tractor although it would be nice to have a protractor that's more universal?