Another couple of small annoyances:
2. This may have been covered, but killing a mob with Series of Shots disrupts your rotation since Followthrough doesn't come off cooldown. You can work around it, but it is jarring, and even feels like the game is punishing you for killing the mob. Suggestion: Add killing a mob to the list of things that completes the cooldown for Followthrough.
This is a known "feature" of series of shots - ft. they know this and hopefully it can get fixed soon (possible bug report).