That form works well. Ok, you and your brother are the perfect sizes for a BUNCH of boards. The one trick that separates your selection is the shuv. When you land the shuv, your board is revert. On most skim style boards, they have a single trailing fin that is mounted on the centerline. When such a board is revert, pumping the boad to catch back up to the wake is pretty easy. The fin doesn't catch on the wake.
The TWP 4.5 and the Walzer Alpha both are twin fins. That configuration moves the fins outwards toward the rail and as such can cause the fin closest to the wake to catch when learning the shuv and also when pumping the board when it's revert.
Realistically, a skimstyle board can do any trick you want behind the boat and several tricks, like a big spin, that would be virtually impossible with a more surfstyle board such as those with a twin fin or tri fin configuration.
Good solid skim style boards that will allow you to spin 3's, do aerials and land shuv's would include:
1) The Walzer Skim Pro
2) IS 4skim
3) Phase 5 Prop, Icon and the Danielo pro model
4) Calibrated Telum and Lovett Pro Model
5) Triple X Composite
and Victoria Skimboards makes a wakesurf board.
The 4skim has a unique fin placement - more forward than than the other boards. The Walzer is lightest of bunch.
Virtually all of the boards can be purchased or reviewed here:
https://generalstore.wakeoutlaws.com/wakesurfers.php The shapes, sizes and ride are pretty similar for all the boards, it principally becomes which price and graphics you like most.