Ok, the weather yesterday was better, so I charged my batteries and decided to test out the v1.10.90 FW with GO 2.8.0 (witch seemed to work nicely the day before).
To my surprise the video lag and VERY bad video feed problem was back!?

I tried both, my Oneplus 3 cell phone and Samsung Tab Pro 10.1 but no go, at least three second lag
BTW, when I updated the bird's FW, the update went all the way to the end (took about 20 mins) BUT ended with solid red status led on gimbal and constant "scree...!!" sound. After reboot status led was green and GO app shows that FW was updated to the latest!??
I tried to re-update several times but it only blinks gimbal led red / green for about ten seconds and turns always to red and makes that bad sound.