If you're not willing to start over with a better soil mix, then get some Neem Oil and mix it with your feeding water.
The plant will absorb the Neem Oil through its roots, so the next time those bastards try to chew on them they'll get a mouthful of the enzyme contained in Neem Oil which will make them unable to eat ever again, and then they'll starve to death. Every single one of them! Neem Oil also kills eggs.
Neem Oil is 100% organic and won't hurt your plant or you. Just to prove it; you can use Neem Oil on your head if you have lice, which also will kill them.
Had the same type of bugs and they were all gone after 4 feedings (where 2 contained Neem Oil).
I would also advice you to let her dry up really good between feedings. I learned it the hard way, so now I'm letting mine dry for 7-9 days between feedings, and I'm using a 200W bulb and a 4 gallon pot (just for comparison).
Hope this helps. Bugs are a pain in the ass for sure.
Good luck!
- C