Congrats on a nice board.
While the Kodes prefer a bit smaller fins for pure wave sailing, they can definitely also be trimmed for a more blasting type ride with bigger straighter fins. If you're looking at the MFC freewave, I think the 25 will be the best option. The 28 might be a bit better when really underpowered with 5.2 (if you're heavy or heavy footed) but even for powered up 5.2 and certainly with a 4.5 the 25cm will make the boards much better balanced. It will also "connect" better to the original Drake 22 (which is also nice for freeride in gnarly, windy conditions).