Rather than just beefing up the HoTs, I think it would help in all situations if the Scoundrel/Op HoT ticked every second. Fast ticking HoTs are much more useful in bursty environments. It essentially gives their HoT a Trauma Probe/Kolto Shell functionality on tanks. When the tank is hit, his damage will be smoothed out a bit by preemptive heals before the next swing.
Let Alacrity works with HoT's. Also when there are 2 HoT's stacked on a target the chance for UH/TA should double as well to make up for the cost of casting them.