Post by oddbrown
The only real use of downranking is mana conservation.
When soloing/grinding/farming you can stop and drink for 30mins and the only person you have to worry about is yourself. No point downranking.
When healing instances you need to consider the
5SR and overhealing (a waste of mana and nothing else) so it is worth considering on longer fights or if you are concerned about mana conservation.
It should also be noted that I often use full rank Renew on tanks for damage smoothing and lower ranks on DPS for hp regen (as they shouldn't be getting hit in the 1st place).
The only other times to use downranking are if you have an AoE you want to use to flush out stealthers (Holy Nova anyone?) in which case just use rank 1, or if you want to drain a dispeller's mana (SW:P rank 1 is perfect for this)!
So in short, use it in instances if you are having mana trouble while healing tanks, use it on DPS who shouldn't be getting hit in instances, and use it to cripple other classes in PvP. Thats about it for downranking while levelling (unless I've missed something...).