Good board for overhead waves, intermediate skill

I've been surfing since July on my 9'6" here in NorCal and it's been great so far. I've been able to progress and catch small, and medium to shoulder-high waves.
Now that winter is here the waves are getting bigger. that log is becoming more of a hinderance than anything. I'm pretty confident that I can catch overhead+ waves (I have done a few successfully with the longboard), but am looking to get a board that will allow me to duck dive and be able to get past the white water much easily.
I've been looking at funboards, but not sure what size would allow me to ride larger waves. I'm 5'7", weigh about 160lb. Would appreciate any advice. Thanks
Now that winter is here the waves are getting bigger. that log is becoming more of a hinderance than anything. I'm pretty confident that I can catch overhead+ waves (I have done a few successfully with the longboard), but am looking to get a board that will allow me to duck dive and be able to get past the white water much easily.
I've been looking at funboards, but not sure what size would allow me to ride larger waves. I'm 5'7", weigh about 160lb. Would appreciate any advice. Thanks