I would go look up better advice elsewhere. The advice in this thread is not very good at all.
Discussion of stat priority for RShamans is questionable at best and totally misleading and false at worst. Every encounter is different, but for general healing most healers prioritize numbers above functional efficiency and throughput, which is wrong.
No amount of spell power or intelligence is going to keep you from healing incorrectly and no amount of crit is going to mitigate the effects of wasting your mana and GCDs.
Stats with no functional cap in efficacy should be your goal when your skill level is low. These are mastery and spirit- not crit and intelligence. Crit and Int will just RNG and overheal you into inconsistency.
HPS is a highly variable stat that depends on overhealing, the gear of your raid, the skill of your raid, RNG, etc. etc. Be careful basing things on that stat.
Give yourself some leeway and room to breathe with spirit and get your timing down. Learn encounters, anticipate where the damage is, get your head out of your UI and onto the battlefield and watch the game. Awareness is everything.