Follow this guide:http://www.hobiecat.com/support/tech/h14tuning.html
For raking the mast lengthen your jibstay or forestay with an additional adjuster. Your shrouds will then be too long so you'll probably need to make new ones that are shorter, just measure the slack and remove that amount.
If you use a mast step link kit to step the mast then be careful you don't make the minimum rake setting too great, I found that if my minimum rake was too great I had trouble removing or inserting the pin in the mast step link. This might not be the case for you, it could be because my boat is from 1978 the step and base have changed since then.
When I first tried this I ended up wasting a set of shrouds as they were now too short and I couldn't use the pin. The handy thing about having shrouds too short was that I could experiment different shroud lengths by adding small shackles to the ends one by one. I could then measure the perfect length when I found it.
So for me if I want to rake more than normal I have to step the mast first and then adjust for more rake. If I put in too much length on the forestay before stepping the past I can't get the link pin out and the mast doesn't seat properly in the step. Fortunately for me the rake angle I have when I step the mast now is good enough compared to what it was before.