Eruption spiking is very hard to hit with (I personally have never hit with it on purpose); it'd be better to just walk-off DAir Fox if he's coming up straight or even run off the edge and stage spike him with BAir (haven't done that before, but it should work).
I think I play a good Ike, but unfortunately, I don't have the opportunity to play any good players offline; the only person I can play with often is my brother, and while he's better than the average casual player, he's not good at all by competitive standards. Regardless, here's my
Youtube channel (there's a lot more online videos than online videos). Here's
Kirk's Youtube channel and
Rykoshet's Youtube channel. In case you're curious, here's
Arturito Burrito's Youtube channel as well.