Hi SmellMe
There is some good info above.
Not sure if you have the chance to test any of the foil setups mentioned , so you can compare.
If you are in Perth, then your welcome to demo my the Slingshot HowerGlide Fwind 2019
This is a unreal package in terms of price vs performance.
The mast is alu and the wings is carbon. However the build quality and construction is much better for the alu masts, than seen on others.
What I also like a lot is that you can upgrade parts (wings, masts etc) and it all fits together. So if you on a later stage need a smaller wing for higher wind / or a carbon mast, then you just add the parts to you base setup.
For your light wind foiling 10-12kts freeriding, the above foil will be very hard to beat, as it is made for those conditions. At lower speed and using smaller sails this foil will give you early lift and a lots of fun.
For pure speed / and extreme upwind / downwind, then it is not the fastest and as mentioned from others a full carbon set up from SB, NP, Slingshot etc. would be the go (but yes you need a little more wind / sail size to get it going, and also $)
If you do have the chance to compare a few then I think the Slingshot and Naish foils sounds like to be in the 'area' you are looking for.
For the Slingshot there is some info here you might find interesting to look at with the specs etc. so you can compare.
drive.google.com/file/d/1EWzqJ8THMOk-0ax9NTvQ-GRp4VFTHBUx/viewI haven't yet tried any of the Slingshot foil boards yet, but from what I can read and seen on video clips, then they are fully focused on freeride / easy foiling .