I thought I taught you the match-up before man.
With Kirby, you just need to apply pressure, don't bother doing cute stuff on Yoshi, he can just use his Armor jumps or his disjointed hit boxes. Just bait out Yoshi's approach and if Yoshi starts to camp with ETS Eggs, just attack back with Kirby's Final Cutter (Up special).
Or, you could just roll backwards just once and wait for Yoshi's reaction. Either way, just full hop Back air and then Rinse repeat with different mix-ups.
Grab only if you're sure Yoshi wont punish hard. A miss timed grab and Yoshi could bair to up tilt to so on.