stakers supposed to have their own logic behind their own custom build, the best way is to have a unique custom to your account that counters the people at your same combat level.
here is a max hit calculator
here is a combat level calulator
there are also max calculators for magic and ranged.
Hitpoints are often a ++, and can win the fight.
Defence can save your ass, and can also be not needed. You need to pick yourself what fits your playstyle best. May take lots of experience to find your perfect build, just keep on trying even when you get knocked down and cleaned.
Also, do some research and learn about PID.