Flash doesn't deal damage and, as such, doesn't benefit from FoF or any other +dam ability (which just to happens to be all of the CC abilities you could possibly use to buff it; this also means that it cannot crit). The only thing you could use to increase you enmity gen from Flash is a STR pot, since that increases attack power, which *does* impact Flash's enmity generation (it generates enmity *as if* it were a ~480 potency hit, so it uses your attack power and weapon damage to calculate the value of said potency).
At low levels (pre-RoH and BB), the best enmity generation per GCD you can manage is your AoE spam. For a MRD, this generally means throwing out 3-5 Overpowers at the start of a fight (and often times running out of TP and requiring a breather because it costs so much), and, for GLA, it generally means Flash spamming until you run out of MP and then Riot Blading back to full (so that you don't have downtime before the next pull).
Until you get your t3 combo attacks, your ST rotations are really just there for damage purposes. Establish enmity with your AoEs and *then* start doing ST damage, otherwise you're liable to lose aggro all the time.