If you are going to shoot grapples at bigger fish. You better get you some poundage on your bow. 60-70# on average. That is about all we shoot on the west coast. I know Kuger does not like Grapples. I shoot the crap out of them. Kuger is in Southern Ca. and I am in Northern Ca. But shoot mostly North in Wa. Or. Id. and made it to Utah this year. Have not had an issue with grapples. Use them mostly in the rocky areas. My favorite head is the GD 4 barb. Tough as heck and holds well. Shooting those kids bows back east is a whole different world. You want a point that makes the smallest hole possible but still holds well. Muzzy with the barbs squeezed in. Innerlock Pro Point. Cajun Stingers. Gene Davis. It is mostly what works for you. We can not say what will work best with your set up. You need to get one of each and go shoot some fish. No point will fully penetrate a cats skull on low poundage. I have shot carp with 70# and had the point look just like in that cat. It is placement to get the penetration, not always poundage. Also the legth of the Barbs to get full hold on shallow penetration.
Just my 2 cents. Others shooting back east might be able to help you more.