Well,
I start with more tip weight that I think I need. Do hard corners both ways and observe if there is hinging. If so, I reduce the weight until it just stops hinging in the hard corner. If it doesn't hinge I add weight until it does. I think that's pretty much how Walker does it. There are other factros in the Walker trim flow chart for leadout rake and balance. Someone will post it here again, I'm sure.
Jim Pollock