That quite a motor Ross, I was going to recommend the 1512 2.5 Ds or the 1512 2 Ds,

the 3d should run real cool on 5s..

. I would be a little concerned about raising the center mount 3+mm (more than the 2mm existing) there is a tremendous amount of torque there so the shims used would need to span a large area to ensure that the force is equally distributed, something to thing about.. Maybe..
How much for that bad boy (?)..
Have a great one..