We have a bit more experience with cat ketches than most sailmakers as I used to own one myself - a Freedom 39 Express cat ketch
design). We just completed a Freedom main for a client in Panama
Most cat ketches don't carry much in the way of headsails. Have you switched boats and perhaps not updated your profile? Frog Kiss, the very successfully campaigned Freedom 44 cat ketch used a staysail deployed from a sprit for light air upwind use. Off the wind
a variety of other sails can be employed. Cat ketches usually don't carry a headsail upwind in heavy air.
There is a 48' cat ketch named Blue Jay which I think is a Lexcen design that does a lot of racing
in SE Asia
. If you can get in touch with the owner (I don't have his contact info), he may be able to share some tips.
How and how far up the foremast will your forestay be attached? Are the spars carbon or alloy? Do you have running backs?
If you're based in Langkawi, I'd probably stick with Dacron. Talk to your local and very talented sailmaker
Erja for her perspective on owning and maintaining sails for a boat like yours. I sailed to Langkawi with a friend of mine and really enjoy it there. You're fortunate to be there, especially this time of year as the season will just get better and better.
Feel free to contact me directly to discuss. I have always enjoyed cat ketches and we would have bought another one if we could have found one on the west coast
when we were in the market.