Hmm..... well since I don't use Ike at all I can't give you any pointers on what to do differently if that's what you're looking for
Is it just Ike that you find has gotten worse?
Cause to be honest, I'm not entirely sure what to do when this kind of thing happens
I know when I feel like I'm getting worse I just use another character like I said before
And it worked! I'm talking about my Zelda btw lol
She was my first main and I used her for a while, but eventually things became stale with her, I just kept on doing the same things and I wasn't really improving. So I left her for a little bit. And when I started using her again I literally started ding things that I never did before, I'm not even kidding
Maybe I'm gifted xD
lol jk
That's really the only advice I can give....
Side Note: DK was fun, screw Ness, I'm gonna try using DK now =D
I needs more tilts.....