Rony I can tell just by your attitude that you’re a good player and I would love to play in your squad anytime. I have not looked at your stats and don’t care to or need to. I can just tell by your attitude, your love for the game and how long you played and the stuff you post that you’re a good player.
Regarding the tank shooting down planes, maybe its sensitivity settings and stuff like that because I’ve messed around a lot with sensitivity settings. I’m always playing with soldier sensitivity zoom sensitivity vehicle sensitivity and vehicle field of view and I usually use the heavy assault tank Canon which is maybe a little different from some of the other tank cannons. The Assault Truck for instance is terrible at shooting down planes. Oh and one trick for aiming is find a spot in the sky where the plane is going to be, let your aim settle there a bit, anticipate when the plane will be there and then fire your canon to meet the plane at that spot. Also the closer they are, they fill the sky more and are much easier to hit. Bombers are so slow they are the easiest to practice shooting down. And when a plane is coming at you head on, it gives you a lot of time and requires less movement to line up your shot. This aiming technique is how I use the aa rockets too.
Anyway good luck if you ever do try again, the nice thing about trying to shoot down planes with tanks is you can do it on your own time, spawn a tank then sit back and have fun taking potshots at planes