I know what you mean about trying not to use pesticides. I'm sure you already rotate, which of course doesn't do any good now but would in the future. Do you mulch? Red or black plastic mulch would make it harder than straw for the larvae to get up out of the ground. My other suggestion which you could do now is to plant radishes near by. Those flea beetles like radishes too so they would act like a trap plant. You'd have to let the pest have at them so it depends on what you value most. I'm thinking it's the eggplant. Radishes have, I think, like a 30 day time line so it would be easy to do now.
I do think the flea beetles like young eggplant though so maybe what you've done will be enough.
Hey...don't be calling my friend a slacker...you are not!!! You've been at this a long time and had phenomenal success! Honestly, I'm more afraid of maintenance and not losing the small progress I've made. Look how long it's taken me to get serious. I have no doubt you'll get back on track...Maybe you need to give yourself a break for a bit. Don't get discouraged. You're an inspiration!