I've been trying the high six approach and had some success, but my biggest problem is tracking the bombers when they're below me. Any suggestions?
My sight line over the nose ideally only shows me the cockpit forward of the lead aircraft. If I can see the whole formation in the dive, I know I'm coming in too shallow. Then, just as I'm passing through 1000 yards, I being to aim for the wing root, and usually open fire inside 600 yards. Now, I use a Jug typically, so I have ammo to spare.
Another thing that helps is to establish the approximate course of the bombers, so that if you do lose sight of them, you'll know approximately where they should be under the nose.
@Tool,
With respect, we're not talking about banging down Lancs in a 110 at 5k over a town.