What racing ski size should i have?

Depends, are you an intermediate skier? or a proffesional skier? For me, Im about 4"10 and I weigh 90 pounds and my ski size is 150(Im an begginer intermediate), Personally, I would change the ski since you are 5''10 I think that a 160 would work for you since my friend is about the same height, weight as you and she has that size. Usually, for a growing person(kid, teen) you should change your ski every 1-2 years. And the ski lengh should usually be from your foot to your nose, (head) if you are a proffesional who can control it. There's nothing wrong with using the skis you have tight now, but you might start to feel it is too easy to use, since using a right size, will make you feel comfortable and it will be extremely fun.

I have 150 slalom skis, and I am an expert skier! Not to mention I am a lot shorter then you! I think you need longer skis!