@Chadwick & Tim76 - did you guys go on a low Glutamic Acid diet as well, or was the L-methylfolate supplement sufficient? I'd hate to have to give up meat and eggs 
I haven't had any reason to go on any special diet, no. 
Chadwick, have you ever tried using low-dose Amisulpride before? Or GHB/GBL/1,4-butanediol?
I'm simply curious due to the fact that a particular user on reddit (reddit.com/u/Yoyomamahh who is a.k.a. reddit.com/u/Nedzilla55 , I believe) found GABA-B receptor agonism fixed his Asperger's issues of low sociability/social anxiety and NMDA receptor hypofunction... initially he made this discovery due to Phenibut being incredibly useful for his symptoms, leading to his now-current Baclofen usage rather than Pheni.
My issues seem to suspiciously align much with yours, and in addition I had my genetic results done via 23andMe, which shows the following (all of these are the SNPs/genes you yourself shared as being critical for dopamine relevancy):
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MTHFR: RS1801133 aka C677T: A;G
RS1801131 aka A1298C: T;T
DHFR: RS1650697: G;G
GCH1 - I do not appear to have any mutations... according to SNPedia, the below are part of a three SNP haplotype, and it appears I have the 'normal' haplotype.
RS8007267: C;C
RS10483639: G;G
RS3783641: T;T
PTS - RS3819331: T;T
COMT - RS4680: A;G
MAO - RS6323 - T;T
DAT (aka SLC6A3, dopamine transporter) - I have the bad 'C' homozygous mutation!
RS27072: C;C
DRD1 (dopamine receptor D1) - RS4532: T;T
RS265981: G;G
DRD2 (dopamine receptor D2) - RS1800497: G;G
RS6275: T;T ---> I have the ‘bad’ (T;T) allele! - MY RISK FOR SCHIZOPHRENIA, ((due to this phenotype along with the (A;G) phenotype for COMT Val158Met)), ACCORDING TO THE STUDY ‘Genetic susceptibility to schizophrenia: role of dopaminergic pathway gene polymorphisms’—> ‘Ratio of cases to controls: 2.54’, and ‘Association with schizophrenia: High risk’
DRD3 (dopamine receptor D3) - RS6280: T;T
-------------------
What are your thoughts on my genes/SNPs...? I'm not sure what to make of it, although the RS6275 SNP seems a little troubling, as I match VERY similarly to the 'negative' symptoms of schizophrenia, which I guess would really in that case be more similar to 'Schizotypal' personality, or 'Avoidant personality'. (Both of which also seem creepily applicable to me)
Currently, I am on the MAOI medication 'Nardil' (generic name 'Phenelzine'), and for the first year or so it worked pretty well for my Atypical depression symptoms but also my social phobia/avoidance.
Now, though, it seems that much of the benefit has gone away, except for still receiving a pretty good effect from it on my social phobia/avoidant ways, and also my overall ability to think & focus.
The fact that Nardil was one of the only things to work for me also makes me think my issues are dopaminergic in nature, because I've done some reading of studies over the past couple of months, one which seems to indicate it's antidepressant effect and overall benefit are derived from it's effect of increasing catecholamines, according to this study --> https://www.ncbi.nlm.../pubmed/2418010 :
"It seems that phenelzine acts more through catecholamine release phenomenon than by inhibition of MAO."
Also, in addition to this, the other major effect of Nardil is to increase hypothalamic-pituitary-adrenocortical activity --> http://press.endocri...10/en.2004-0650
Lastly, I have the MAO-A SNP which actually appears to indicate my MAO-A is already underactive!
Since I'm trying to quit Nardil and ultimately solve my issues by other means, and REALLY get at the root of the problem, do you have any advice for what might be best used?
I should also mention I've been using Kratom since about 2 years into my Nardil usage, due to the fact that I need something stimulating/dopaminergic... however, it is at a dose of about 1 to 1.5 grams, and only up to 3 times a day spaced out (so I believe it should mostly be the stimulating effects rather than delta-opioidergic agonism or u-opioidergic), and always drink a cup of coffee alongside it.
I'm debating everything between Methylfolate, Uridine, Fasoracetam, NSI-189, Sarcosine, low-dose Amisulpride, BH4 (aka Tetrahydrobiopterin), Noopept, Tianeptine sulfate, Baclofen, Pantogam active, GHB/GBL/1,4-butanediol, SAM-e (perhaps alongside Betaine to increase it's beneficial effects as stated in research papers?), microdosing of a psychedelic like 4-AcO-DMT, Nigella sativa (black seed oil), Low-dose naltrexone, Pregnenolone, DHEA............ could really use some advice at this point obviously! Hahah 