If you consume meat and fish, I'd drop the zinc. Are you sure you are taking 375mg of that a day? Zinc toxicity will cause nerve damage over time.
Here is a monograph on zinc:
Zinc | Linus Pauling Institute | Oregon State University
notice that the RDA is 11 mg.

High zinc may throw a person a copper deficiency. I'd get a blood test for zinc, copper and the zinc/copper ratio.

What does your D3 dose mean? D3 is typically listed in IUs and not milligrams.

Sorry, i realise that i'd made a few mistakes there, (i live in finland and reading the labels here is somewhat tricky to a non-native finnish speaker )

Here is the corrected regime:

Daily:
B12 5000mcg
B9 800mcg
B1 500mg
Mg 600mg

These 3 i take only every few days:
D3 25 ig
Zn 15mg
K 300mg

I was expecting to see some results by now from the daily regime but nothing yet. Does supplementing usually help in the average idiopathic case? Or is it only more helpful in finding the underlying cause, eg Methylfolate and MTHFR deficiences or Bentofiamine and alcohol related issues?