Yes. You need a book. Start with downloading Hobie University, and at the same time, order a copy of Rick and Mary's "Catamaran Racing: For the nineties" available on the shopping section of this site.
You have a bit too much weather helm; the instant fix is to leave the jib in tight while easing the mainsail. The actual fixes: if your rudders are travelling at less than about 4 degrees angle to the water, they need to be raked forward, so that the bottom tips of the blades are more under the boat. This will lessen helm feel, sort of a power steering effect, but will not change the angle of attack that the rudders have to the water. The next thing you can do is rake the mast forward, admittedly not usually a good plan when it's windy.

sail fast!