Set a button on your stick to MGs only, that way you can fire the machine guns independently of the cannon, and only open up with the cannon when you have a clear shot.
Fly the K4. MK108 has a slow rate of fire.
It hasn't. One of the advantages of the MK 108 design was a relatively high rate of fire for it's caliber, about 650 rpm. In comparison, the Hispano had 600-700, the MG 151/20 600-750. It's the signitificantly more powerful Mk 103 (Me 410) with a lower ROF of about 400 rpm.
For some reason I expected to see a link to this..... http://www.youtube.com/watch?v=iU5qp-cAtOU