***Prop Dia Pitch blades Make
x438 1.5 2.1 2 Octura

1732 1.26 2.142 2 Octura

there is the diffrence ! lol hehe
water cooling is good no matter what !
if you can try move your motor back so that the can isnt under the deck try to make it so that the can is under the hatch and if you can swing it get the aluminum tube water cooling cuz the mnetal tranfers heat/cooling better