Expected bullets off a bit first 100 ticks of first round

I was having very iffy performance against bots that don't use setAdjustGunForRobotTurn(true); until I discovered I was taking the delta-heading from the wrong tick - it should be lastEnemyHeading - lastLastEnemyHeading, rather than a tick even further back. If that isn't the issue, I'm not sure what is - it could be that my shadow is slightly broader, but DrussGT only gets ~70% vs. Fuatisha, so clearly at least there my shielding isn't enough to completely shut it out. Unless I've got a bug in my integration code...