One thing I noticed is that you tend up to throw upwards after your grabs. I'm not saying that is terrible or anything, but there aren't much ways to capitalize on combos by throwing up and I was able to escape from being comboed. I usually just throw opponents forward or backwards depending on where the offstage is. You can stage spike them early when they reach around 60% to KO your opponent that has moderate damage. At low %s you can throw forward, use an egg, and run up and grab them again for an early combo. Yoshi's up-tilt is really good for combos. At about 40% range you can up-tilt into a 2-3 up-air combo with the use of Yoshi's double jump. You can also aim and throw an egg for more added damage. This combo does at least 30-40% when done correctly.