I put this Tarot on a brand new build earlier this year., Flew great for the first three months. Then one afternoon the IMU must of locked up and I was getting an error "GPS C". Plenty of sats and power finally put it into RTL mode. It is now on a five year mission exploring the bottom of S.F...
You are too far into this to quit. Like you Vitaly I'm also putting togeather a Vulcan quad. Let me know how it flies and what is the FC ? "Experience is what you get what you dont want" Good luck my friend.