Hi and welcome ... although I feel silly saying that because I'm so new, too.
So ... 2 things:
1. I put some vals in a tank with basically the same plants you have, all doing fine, and it was like the vals took one look around & then died. However ... they are coming back. It doesn't sound like you've had yours for long, so maybe they're just adjusting and need time. I'd be hesitant to start worrying too much about what you're not doing for them, because that's potentially a long, long road of buying things, tweaking, etc., and basically being stressed and losing some of the pleasure that comes from enjoying your tank. I'd first just wait and see if their problem was just stress from acclimating.
2. Re: other plants, I have some water sprite in my low-tech (Aqueon package 10G from Petco, with a couple of small upgrades) tank that is going absolutely gangbusters. It's also a nice contrast to the anubias and java fern type plants -- very wispy. There's a profile on this site. Of course I can't remember the latin name right now ... initials are C. t.
hope that helps a little!