-Full Thrust combo has a total potency of 680 and an average potency of 226.67 (680 / 3), not qualifying Heavy Thrust or Disembowel (which hurts my credibility, but go along with it for a minute please.
-Chaos Thrust combo has a total potency of 900, and an average potency of 300 ([600+300dot] / 3). However the total potency exceeds FT at a mere 3 ticks of CT (600+90).

Phlebotomize is 320 total. 170 (0 ticks) > 195 (1) > 220 (2) > 245 (3) > 270 (4) > 295 (5) > 320 (6).

If you clip Phleb as much as 2-3 ticks early or CT as much as 5 ticks early, it is still way over net positive from the "baseline" of TTT. Discounting cases where you applied a buffed DoT and clip it with unbuffed, but even then you'd have to crunch some numbers to back that up.

DoT clipping is not a crime.