Take it your having 2 of these made to sandwich between the tecs?

Make sure you get it done up very right along each part of the tec, maybe 4 mounts per tech.

Making the trasfer from the copper block to the path of the water is what will help, Mart knows this well so ya need to sort that i think.

437w tecs x 3 will be the best thing you can do i think. It'd cool more.

However you'd need more than a PA160 too cool the hot side!

It's going to eat lots of power too sadly