Hi, Mozart, welcome to the Burning Thread.
What kind of E9 did you get? Generic? Green Smoke? Red Dragon?
E9 (Kr808D-2), a close relative of the Kr808D-1, is not very popular here, for various reasons, but mostly because it's not considered to be a very good PV: it's expensive, the cartos are only so so, the batteries are mostly automatic and the whole system is not compatible with the most popular 510 and Kr808D-1 models.
That said, I started with GreenSmoke and used it for a while; it worked, but I ended up sending it back. I switched to the Kr808D-1 and then to 510... It seems you're going in the opposite direction...
May I ask why you switched? And why don't you like the eGo? If you tell us that, I think we'll be better able to answer your questions.
If you really like your E9, you can get generic cartos at leCig.com and see if they work better for you than what you're using currently.
You can also get adapters from the same place; D1 to D2 adapter will allow you to use better, stronger, manual kr808D-1 batteries with your E9 cartomizers.
D2 to D1 adapter will let you use your E9 batteries with KR808D-1 cartos, either Boge (and its many variations) or Bloog (and its many clones).
Either combination should be an improvement...
Whatever you do, keep your cartomizers wet at all times to prevent burning. E9 cartos can and should be refilled often.
Hope this helps.