A little big picture overview, my less than two cents. I am a mono-hull and multihull sailor. So trying to offer a broad perspective. My first experience with cat spinakers was the Hobie 21 when it first came out with a chute. That design sucked. Built by monohull sailors is all I can figure. Problem, too full for a cat (think low and slow). I then went to Prindle 19 with spinnaker and now RC27. Technolgy in asymetricals for both cats and mono-hulls (melges 24s) has been flatter over all these years. Objective is to get the apparent wind all the way forward. You should be going down wind so fast that your main is all the way in and jib and spinaker are all the way in. Your apparent wind is so far forward you must drive off. You will be flying down wind at twice the speed of competition (trying to sail conventionally). This is how Randy Smyth does so well. It is how the top sailors in Melges 24s do it now. It has taken years for many to realize. I think this is the reason the hooter was so popular and effective. However if you do not push the apparent wind far enough forward it will not work. Too many use mono hull experience to influence technique on a catamaran. I bumped into Randy Smyth racing his tri down at the St Pete NOODS and asked him about the Volvo 40 program. He basically said they sheet everything in all the way whether going up wind or down wind the sails are adjusted the same. Full speed all the time. The arguement has always been which is better low and slow or high and fast. Answer high and fast, real high....no, higher than that...
Of course this will not work with no wind, it is an overview. However, Randy came on our boat to race with us and I can not stress the difference in how high he sailed the boat verses what I had been used too. I literally thought we were going up wind. However the results were basically amazing. Just passing along some great advise from a great sailor (that sailor being Randy).

good luck.