there should not be a 'set' number of warmup sets... you do what is needed to get ready to pull heavy...
if your 10 rep set doesnt fatigue you, then it had might as well be a warmup...
i have more warmup sets than working sets as my strength has increased over the years... i might do 5-6 warmup sets and just 1-3 working sets...
deadlifts and squats are what you should be putting everything into- after 1-2 working sets im usually beat...