Mind crush is your weakest dot tick for tick, as it ticks every second, where WM and SF tick every three seconds.
Not sure I understand what you mean.
Force Suppression (Deathmark) - Increases damage of next 10 DoTs by 20%. As such it seems that you get the most from your highest damaging DoTs. Dunno why the fact that one ticks every second and the others tick every 3 seconds matters.