Hard to say how many girls use and what I have experinced is that it is a moral issue with some. If they are pro, chances are they use something in some capacity but it is not bodybuilding so some actually might not take much if anything and without knowing them personally, I can only vouch for the pro's I do know. They seem to love Anavar and Winny with Deca in off season.
I would tweak your raios a bit on the diet as you want to add size so carbs will be important to fuel your hard training. I would start with a 40% P 40% C and 20% Fat. Too low of fat can make for achy joints and will help with hormone production as well. Since you are training pretty heavy, you can even get away with 35% C, 40% P and 25% F. Fats should of course be mostly EFA's and only 10% of the 25% saturated at most. Carbs should be complex, lower sugar and even add in your vegies for fiber and will stoke your metabolism as well. Protein of course lean meats, powders, yada yada yada, you should know what is what...
With regards to you training, the lower reps is fine and will work, don't get me wrong! But I feel you will need to go thru "meso cycles"> meaning, change it up! You may go a few months with the heavy, low volume training, then train in the 8-12 range, then 12-15...you will have to see what works best for you and being young, you have time to figure (no pun) that out. I have only one girl who does great with 6-8 reps, most others 12-20 reps. Keep a journal of your progress not only for poundages, sets, reps and diet but how you feel. ie: tired all the time, achy joints, too sore, etc....that way you can referance what is working for ya' and make changes when needed.
It is good you know what you need to work on as judges like full round delts with a V taper so don't let your waist get out of hand. Try to also focus on upper back, traps as that is a differance maker in figure. Do you have the same structure as Gina A.? Every girl has differant structure so find a girl that has the same delt to waist ratio and see what she did to get where she is..
Is it the LA that you are doing in So Cal '08? If so, plenty of time and will see you there, I am doing it as well if all goes well...PM me if you like and good luck!
Guys, you can argue and suggest whatever you like, this is all just been my personal experience!