The biggest problem I have observed is not in Tanks or Ostwinds themselves.
Its the pilots attacking them.
From my experience, 80% or more of all attacks on my armored vehicles are strafing attacks that come from about 4k out, straight in at a very low angle of attack (10-20 degrees dive) at tree top level.
This is the easiest type of pass to make, but guys this will get you killed every time if your attacking an Ostwind, because it makes you a very easy target yourself.
There are two different techniques that can be used in successful ground attacks.
1.) Make a high angle dive bomb/cannon attack. This should be done with at least a 45 degree dive, or even as much as a 90 degree dive.
2.) Low level strafing pass with a jink. Make your normal low angle attack, but instead of point yourself directly at the target, aim your nose at about a 10 vehicle length point in front or in the rear of the vehicle you are attacking. This makes you a crossing target and much harder too hit. At about 2k-1.5k (or closer if you can do it and still get the shot) roll hard back into the target and fire as normal.
Just a few pointers I have picked up, both from attacking, and playing target

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Vermillion
**MOL**, Men of Leisure