RE: Freeride sail options
I'd suggest the 6.5 m2 and then look for a 7.5-8.0 m2 that may fit on your 460 cm mast.
On a big board like the Carve 144 you can easily hold down a 6.5 m2 (at your 165 lbs.) in Force 4 Bft (13-18 knots).
I'm sure you will find that you need something larger (as soon as your develop your skills a bit more) to get the Carve 144 planing earlier.
Probably an 8.5-9.0 m2 (or larger) for Bft F3, but not until you are comfortable on a 6.5 or 7.5 m2.
Hope this helps,