You appear to be set up pretty well for the rest of the game :).
One thing to keep in mind are the enemies that are yet to appear. More and more elite humans, nightmare enemies, and even shamblers and Cybies will start to come in to say hello, and sometimes they will appear in single-monster levels. A nightmare-demon or even nightmare-arachnotron cave is a thing of, well, nightmares. Elite humans, on the other hand, carry improved weapons, all the way up to a napalm launcher.
So perhaps the only advice would be - don't get too cocky, have some escapes (phase devices FTW!) and use them sooner than later. I hope to see your mortem in the Century Lounge soon! :)