Always leave at least 5000~7000 feet of altitude below you - this is your 'bottom limit' if you are flying in a 190 to not only score victories, but return home with it. Leave the deck-alt fights to the belly scratchers.
When all else fails, the best friend you have is something all pilots must go through no matter what kind aircraft he flies, the ultimate factor that is equal to all - black outs.
Not too many aircraft can match the roll speed of the 190 in a high speed(380mph+) status, and those few which can match the roll speeds still has to deal with danger of frequent 'tunnel vision'.
Nose down in a powerful dive, gain speed and start turning until the black out starts to cloud your vision. If the enemy behind you is closing on you, it means he will suffer the black out too.
At that point, start rolling.. 180 degrees, 270 degrees, 90 degrees, whatever is unexpected for the enemy. 9 times out of 10, the enemy overshoots into some other direction, because even if he can match your roll speed, he does not have adequate vision to spot where you are 'veering off' under the nose. By the time he levels out and spots where you are, you probably would have gained a lot of distance on him. Though the arenas are infested with late war planes, all 190s are reasonably fast planes, and only a handful few planes can catch you after this event has transpired(A-5 can out run Spits and N1K2s after this move, and even planes like the La-7 has to go through a long chase to catch you again. In the case of the D-9, it's virtually untouchable if the enemy is anything short of a Tempest). That is why you need a 'minimum altitude' to fly the 190.
What I am suggesting is not anything of a fancy move, and it's more of a last resort which works with high probability. I'm sure there are many more things which much better 190 pilots would suggest.