OK so either something's wrong with my earlier tests (i'm suspecting there's a bug in offensive adaptation since i had to re-toggle it last time to get -13.33% instead of -10% on the pylon) or Bio/TW tanker's just a bit too strong.
First two pylons:
2:21
2:11 (less mistakes)
Then tried a chain with defensive sweep and got 2:21.
This indicates there's something wrong with the previous test somewhere since it should have been closer to 2:40, seeing as my Justin numbers were 3:13. It could also be due to the nature of Pylon tests that use health ticks to measure DPS, so it's possible that the Justin tests were just short of a tick somewhere.
For the fun of it I went for a run with Radial Assault Hybrid toggled on, and got 1:51. Had another run with Assault Core Toggled, and got 1:34.
New build, with Melt Armor:
Hybrid toggled off
1:50
1:42
Hybrid toggled on
1:27
1:26