GT 1450rpm is 0.049A each (wow)
GT 1850rpm is 0.083A each (wow again)

so...

4x1450rpm = 0.196A
4x1850rpm = 0.332A

TMS200 each fan/pump header can handle 2A. You're well within.

In fact if my math is correct and the amp figures are correct, you can power up to 24x1850rpm with 1 header. That's unbelievable (and almost certainly not safe)!