I found out a few great practice habits last year when I interviewed some tour players that have won.
It seems there are a couple of ways to practice depending on whether you want to change something or prepare for an event.
When they are making swing changes they will focus a lot on the mechanics and trying to make the change as you would expect.
But, when they are preparing for an upcoming tournament or durnig the tournament week they practice very differently and try to avoid mechanics.
Here's what I found out they do for practice so they are in the right mindset for an event:
-Mix up their shots so they aren't hitting the same club or shot type each time
-pick a different target for each shot
-try to imagine a shot they will likely need on the course they are playing so they can imagine playing it on the range.
-pick a yardage for each shot rather than just hitting a "stock" 7 iron.
-use the preshot routine
Basically, they are trying to simulate playing conditions so when they play, they have practiced what they do on the course. Makes sense to me. I think a lot of people whack the same shot over and over and then can't take it to the course b/c on the course you don't hit the same shot over and over.