Flash of Light already heals for shit.
Glyph of FoL makes the initial heal lands for shitty amount, and the HoT just heals for too freaking long.
two simple suggestion are:
1) reduce the HoT ticking time from 15 sec to 8 sec.
2) let the HoT stack.
this allows you to do the following:
sacred shield > FoL > FoL > tab > sacred shield > FoL > FoL > tab > sacred shield > FoL > FoL > tab back to the first guy > FoL > ...