Dear Flavio,
Value of inductance was calculated based to frequency 200 kHz, but I am already using 6,1 uH.
NAND gates are used because of propagation delay in primary side that is about 10 - 20 ns and it is caused by ADUM isolaters. I reduce delay by disconnecting capacitors.
It is not possible to phase shift of channel E and F, it is only turn off delay, but I am facing that secondary fets are already tun on, but primary side it still off.
Yesterday I found great problem with my PCB and it is too sensitive (secondary fets) to interferences that cause that fets are not correctly turning off and on.
It is caused that this PCB is already almost year old. Now I will try to reduce sensitivity but it is sure that I will need to do upgrade PCB.
Thank you Flavio for your help