you got the infamous snake dash nonsense
Hahaha XD Thats what I'm calling it from now on. Imfamous snake dash nonsense.
Okay, tips. The most important one is: get Snake in the air. If you're both in the air, don't hover above or behind him, but he's totally open if he's in the air facing you, because his fair takes a day and a half to come out, and you outrange his nair.
Don't ever go above Snake.
Ike and Snake can gay each other's recoveries pretty well. If he cyphers close to the stage, dtilt spike him. Use aether to recovery more than QD.
Space your fair. Jump, hit fair, and as soon as the animation starts, slam back and DI away. He shouldn't be able to shieldgrab your fair.
You have to get Snake off the stage. His front aerial game blows. If he cyphers near the stage, spike him with dtilt or dair, if he cyphers far away from the stage, use the aetherspike. You can't aetherspike Snake if he just started cyphering though, he has super armor frames during the beginning, but if he was so far away he had to use cypher sooner, you can aetherspike him near the end of it.
Hopefully this advice gave you some new ideas, but don't give up on Ike. Its constantly an uphill battle using him, but it makes victory that much more significant.
Also, add my friend code, and I'll send you some fights I won against a Snake if you'd like.