Not seeking an answer here - I know it.
When I googled it I found nothing, so I thought I'd try to help the community by posting here.
If you're trying to farm commendations from a particular planet *after* you've done all the quests there and spent them all, come back at a high level and do the heroics. They're repeatable daily, and despite the information on sites like torhead.com etc, they DO offer commendations (2 or 3 at a time) as rewards.
As a 40 sentinel with Doc out, soloing Alderaan's Heroic 4 quests (level 29 ones) was a cakewalk.
PS did it because I looted Muse Vestments (chest) from a random mob, thought the set would look good on Kira and the pants are only available for 12 Alderaan commendations. See below: