Keep in mind that the time you need to regain E may actually be relatively short. You don't have to exit the fight completely, i.e. out of icon range. You just need enough time to climb out a little and assess the situation before you dive back in. Good situational awareness can also help. If you have a decent idea of where everyone is, it's easier to decide whether to climb out and dive back in, or get the heck out of dodge.
I prefer to use the A5 in low-level furball situations where you can pick a target out, drop him, then take a few seconds to climb, and repeat. You use your speed and acceleration to pull yourself out of the fight, have a look around, then go find another victim.
Think of flying the 190 as being a shark. The furball is a school of pirahnna. If you stay inside the school you're going to get torn to pieces eventually, so you dash in, rip a fish to shreds, then swim out just far enough so you can look for another victim, and repeat.
-Muzzy