Im using the "shotgun" convergence myself: One set to 300, other to 600 yards, and firing mostly both sets together for max effect. Personally I don't like to change convergence according to what kind of fight I do expect, I prefer consistancy.
Apart from that: 262's can endure a lot of stress, the problem is just that it's very easy to push it beyond the usual limits, due to it's high speed/acceleration and very good responsiveness at those high speeds. I can't give you any exact numbers on G load right now, I have to admit that I almost never watch any instruments when fighting. Just be careful, be easy & gentle with the 262 especially when the fuel tanks are still full. Best way to learn the limits would be to do some 262 flights offline or in TA, trying to push the limits. Learn to listen to the sounds (wind/ groaning airframe)
More than with other fighters its important to think ahead when in combat. Use your insane zoom climb capabilty.
When attacking bombers, don't rely on your speed alone, don't think "Naw, he cant hit me at 500mph". Use your speed to set up your attack like you would do with any other fighter - don't attack from 6 or rear quarters in general.