So if yoshi mains want to keep there grab-release combos, why don't you let them? You let the other chaingrabbers keep at the very least a tech-chase, or a good compansation for their loss. I would suggest change the frame data so that when a character is released the only thing they can do is air-dodge a yoshi follow up. That way it is in esence a aerial tech chase. If they don't air-dodge yoshi can hit them with uair, nair, usmash ect. but if they air-dodge yoshi can still pursue them and punish the air dodge. and maybe go into another grab.