I also say let the tree decide, but in a different way.
each tree will tell you where to cut it based on knots, rot, sweep, or other flaws.
don't stretch an 8 to a 12 if the last 4 feet have more flaws all around(unless you have an order for 12)
dont cut all 8 if the thing is round straight and clear for 12 or 16(unless your order is for all
I have cut over 600MBF on the mill and sold more than that in logs since getting the blue ox
my bottem line on sold logs has been increasing, even thought the yearly volume is nearly the same, because I am beginning to "see" the good parts of the tree and cut accordingly