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1
ok, made modifications as T3sl4co1l suggested. The ringing is gone and efficiency (used current) stays the the same. issue seems to be solved.

2
Hi, could you post a sketch of your circuit - to better understand how it looks/works.
I found identical gate drive circ described on page 53 of this paper:
https://pdfs.semanticscholar.org/1265/19da946b5df9b8941a521d5a7019720bcd0d.pdf
However not fully studied it yet...



 

3
here is layout.  Traces of R408 are short  as well as C422 to Q406.
nearly all bottom layer is poured with GND. Could it be a problem? 
The circuit is from:
https://www.elektormagazine.com/magazine/elektor-201611/39970
(click download article and see Figure 5)
This ciruit seems to be tested to work and it does work for me but the ringing creates noise which I want to avoid. 

Also I'm reposting this topic at 4hv.org but they do no allow me to post pictures (circuit and and layout)

4
Hi all,
Trying to make ZVS mazzilli circuit with active gate driver and getting bad ringing at switch over. While trying to debug it, found most noisy point to be on collector of Q401(Q402).
Here is my circuit attached with scope traces of that point and of ouputs. Could somebody experienced give a hint what causes this ringing and how to fight it?


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