You will find there is a fairly significant adjustment needed if you have previously been used to a monohull. In particular, you will use the traveller a lot more, especially when close hauled, to power up the main. I frequently have the traveller half way across to the lee side to get most power. Contrary to most reports from multihull sailors, close hauled is actually faster than reaching.
The headsail is also critical. I got a new sails late last year and realised for the first time how well the boat went with the right balance between the head and the main. The boat will round up if the headsail is not pulling well.
My suggestion is to find a highly experienced sailmaker specialising in Cats and get him to sail the boat with you. You may find that just minor adjustments will make a huge difference.