if you have high TP, you can use Facture. normally I stop using it when I got 400 TP left.
if you know the fight well enough and know when there a break coming up (T12 final phase plume + drive and T13 Drive phase) , you can keep your TP low enough so that after the break you will be just at full TP or nearly full TP.

as OT you right there no real way to conserve TP but there a way to burn it faster by using Facture.
if you sitting at high TP right before the Drive phase, then you will most likely stand there wasting TP tick. (that How I think when I OT or MT the fight.)