Sarah,
There is no magic weight to correspond to each inch of height. Every single body distributes the weight differently. If you are serious in finding your body's set point weight, you may wish to consult with a doctor who can tell you what range is most healthy for you to be in. Once you are in that range, your body will work out for itself what weight is best for skating.
Comparing your goal to the weight of an elite level skater of the same height is not likely to be healthy, unless you are skating at an elite level and following nutritional guidelines specific to your body and the amount of exercise you are getting. I am guessing that if you are 5'4", your range should fall around 120 (5 lbs up and 5 down). Your bady may be able to handle less, but I wouldn't recommend it right away. See if you can reach your range (any of it) first, and try to stay in it a year or two. Chances are, if you are skating and exercising consistently , it will naturally begin to fall a bit on its own. The elites you mention all started young enough that their bodies have grown up into the lesser weights. As you have already gone above your range, you may not need (nor be able to) go to such a low weight to be able to do your jumps.
I eat somewhat healthy, but do not calorie count, and am fairly consistent in staying in a range that my body functions well at without being on a continual "diet". As I skate, I find that when I am jumping more, my weight actually may go up a pound or two, while when I am concentrating more on MIF and stroking a lot, it will decrease by the same. As long as you are in a healthy range, your body will fingure it out for itself, and a physician (one that is NOT affiliated with a weight loss program!!!) will be able to help you determine the ten-pound range for your bady and activity level.
As far as off-ice training goes, I am fairly limited right now due to knee injury, but I still try to incorporate cardio (generally through blading 15-30 miles once or twice a week) with weights (alternate arms and legs and core maybe twice a week) and finally stretching (either in a class at the gym or while studying at home). To improve your jumps, you especially want to strengthen ALL of your legs and your core. Pilates is very good for the core, as is yoga, although you MUST make sure that the yoga instructor takes time with each move, helps her students find the correct form and positions, and really helps you become more aware of your body movement, instead of just talkin' chakras and then twisting bodies up with no regard to positioning.
One other thing I used to do, is jump rope and skip. I still actually sometimes skip down the street, to and from classes. (Obviously I have become less concerned about how crazy people observing my behavior may think I am in order to maximize whatever time I have to improve my skating). While skipping, I concentrate on really pulling the knee through straight, and getting as much height off of the jumping foot as possible (simulating an axel on each foot, only minus rotation, and I only bring my arms through, but don't pull in).
Hope this is a little helpful. Good luck with it all, and just remember it is better to take the time to find your weight correctly and in good health than to try to crash into it suddenly!