yes, divide the masteron.
I wouldn't worry about your liver. I have taken 150mg of anadrol as well as other orals in a cycle and I was fine. That would be WAY more toxic than your cycle.
I agree with progressive though, you really need an injectable in there somewhere.
What are you trying to achieve? Winny+masteron+dbol is an unusual stack. Are these simply the steroids you have?
I'd save the winny and masteron for a cutting cycle and stack the Dbol with some EQ and Test. to bulk up.
If you are going to include winny in a bulking cycle then the best roids to stack it with would be Deca, Fina, or Anadrol.
Best of luck.