Tbh - just looking at the first four bosses in your logs, you should quit the class and reroll hunter.
Just kidding
Your performance is not bad, two things are impacting it on the logs: 1st you are healing on a raid team that has one too many healers imho. The overheal % of your healers is very high, so there is not much for you to heal, which will make your relative performance look bad. 2nd the other healers on your team out ilvl you by ~20 ilvls, this will also contribute to making you look relatively worse.
Things you might want to try: if you are standing outside of melee take BoL, inside melee take BoF. Move bestow faith higher in your priority. Move light of dawn higher in your priority. Stop using Holy light all together (use only FoL in its place, or if you dont need that big of a heal then dps). Use judgement of light, and cast judgement on cd. Take aura of sacrifice as your cd, if you do a bestow faith - aura mastery - light of dawn - holy shock - flash of light ; you can take an enitire raid from near zero to full solo, its a very strong cd. In general your priority for non-ohshit moments should be something like this: HS, LoD, BF, Judge, FoL
Try a raid like that and see if you like it better. If one of those other healers has a dps spec, you should 3 heal it instead of 4 heal it imho.