On my setup i have memorysize setted to 200MB… buffermode 1… and readfactor and 1.5.
On my setup i have also tryed, in the pass, to raise the memorysize to 500MB and also, in the pass, i have also tryed to use value like 99 for readfactor but i’m now know one thigs:
Nothigs of that can really help if you obtain buffering problems 
From about one months… i have also setup a 130Mbps Fiber and my Pi2 it’s connected directed by LAN to router but nothigs resolve… if you obtain buffering… buffering still