No BAR, nothing you can do will affect how well the other guy aims. Period. Thats a fact. ABSOLUTELY NOTHING you can do will affect how well the P-38 aims his bombs either.
And, exposing the side armor in a long rang engagment isn't the smartest thing you can do (unless you are behind the front line as opposed to engaging the first tank you see, and from your post I take it you assume it is also the furthest forward) as most of my tactics involve working my way into the range where I can turret you, and then kill your engine as you turn tail and attempt flee. Exposing your side armor makes it easier for the M4A3 you didn't notice to slip around to your right/left (depending on wich side your rear is facing), and put a round in your engine, making the whole point of putting your side to the enemy irrelivant.
And I think I have a film of that tiger at V85, but I'm not sure. It was a couple weeks ago, and I've attained other films since then.