maryb
You have the slow versions of COMT and MAOA. This means some neurotransmitters (serotonin, dopamine, norepinephrine, and epinephrine) stick around longer. So taking supplements which are precursors to those might be unpleasant. Methyl groups also shouldn't be needed, and might be unpleasant. So supplementing high doses of methylB12 could be a bad idea - hydroxyB12 might work better if you try B12.
VDR Taq means you might be a bit slow in producing in dopamine, norepinephrine, and epinephrine. That's probably a good thing, since you're also slow in getting rid of them
MTHFR A1298C means you might have a little methylfolate-related trouble, and supplementing methylfolate might be helpful. But a small or normal dose might be a better place to start if you do try it - not high doses, due to your slow COMT and MAOA.
MTRR might result in slightly elevated homocysteine, due to possibly slower conversion of homocysteine into methionine. But the studies I've seen only show this happening to people who are "GG", not "AG". If your homocysteine is elevated, you might need methylB12, but due to your slow COMT and MAOA, it might be a good idea to get homocysteine tested to see if there's a problem before trying methylB12.
MTRR A664A doesn't have an impact on the functioning of the gene, so no need to worry about that one. Same for CBS A360A.
SHMT1 is also only known to have an impact when homozygous (AA), but at most it might mean that a little methylfolate and folinic could be helpful.
SUMMARY:
You should probably stay away from supplementing high doses of methylB12 or methylfolate, though a small or normal dose of methylfolate might be helpful, and hydroxyB12 should be safe. A normal dose of folinic acid also might be helpful. It might be worthwhile to get your homocysteine tested (if it hasn't already been) to make sure nothing is going on with that.