Cheers, from what I can see there there is nothing seriously wrong with your setup at least, the bot kicks in etc. What it seems to indicate is actually the same issue I had when it broke for me last night (was only 30 secs left on the boss so just finished manually). Did this start happening yesterday (I know HB was updated so if it did that could explain it).
Basically it's spamming your gloves (this may not be the complete issue but it's definitely not helping), if you could check / answer the following that would be great. Then test on training dummy.
1 - Are you an engineer? If so are your Chronomancer Gloves tinkered with Synapse Springs? If not, make it so and try again. If not then try to disable this in settings, your log shows it is enabled.
2 - Does it work if you leave Cooldowns disabled? (Toggle cooldowns off before pull), just to test, obviously we can't leave it like this.
2a - If that does work without cooldowns try casting Synapse Springs manually before enabling cooldowns then toggle them on.
3 - Are there any other gloves in your bag? If so, remove them, sometimes it gets confused.
silly me.. i killed celestials and got some tier gloves and i already had em! forgot to vendor them! thanks!