Several things can increase TH.
1) PG to VG ratio, for more TH, use more PG in your blend, 90/10 or 80/20 PG/VG.
2) Nicotine; you may try to increase nicotine strength in your juice to 12 or 15 mg/ml and see it that helps.
3) Wattage (heat, power) at which you vape. The warmer the vape, the better the TH. Most people find their sweet spot somewhere between 5-8 watts, more or less. Try increasing the voltage on your Twist gradually until you get more TH, especially with your T3--those work better on higher voltages. Use this calculator to help you find your sweet spot.
Online Conversion - Ohm's Law Calculator
4) Certain strong flavors like cinnamon or peppermint seem to increase TH--at least for some people. But that is very subjective, of course.
Good luck and welcome to ECF!