Not Stock AtomicsGiven your stats, there is no way that you will be able to bend a stock SL:12 (black plate model)... at least you won't be fast on it. I think you asked these same questions relating to GS skis last season and got roughly the same answers.
Basically if you are racing you need a 165 - you don't have a choice in the matter. If you only weigh a buck-30 you shouldn't be on a race stock Atomic... and possibly not a race stock anything unless someone has already abused it for a season to soften it up for you. As I said last winter, look into French manufacturers (Rossignol, Dynastar, Salomon) and possibly Elan. You will want to find a ski that suits your weight. Those 4 manufacturers tend to run pretty soft when you ski them. Elans flex stiff, but the huge sidecut makes them easy to bend and leaves you with a ton of rebound at the end of the turn. A lot of lighter female racers favor Elan, Rossi, and Salomon - so those companies are not out of the question for you. The softer race stock skis out there should suit you fine.
If you wanted to stick with Atomic, go with the retail model SL:12. I have skied both the stock and retail SL's from atomic and they are very different beasts. The retail skis are easy to ski on and very easy to bend, while still offering edgehold and quickness in a course.