I'm assuing that the 4th level longbow proficency is coming from the oracle favored class bonus? Plus you can get the feats that you're missing on a temporary basis via martial flexibility...
This is actually a pretty well thought out build, and I'm going to have to think about running one of these at some point.
The only suggestion I can think of is if possible you may want to see if you can somehow get your strength up to a 14. It will help a lot with composite longbows. If you do that, you could also substitute the lame curse for the legalistic curse. Legalistic fits kitsune pretty well if you are into the old japanese lore about them.
If you aren't concerned about an additional 2 points of damage, then your current build should work pretty well.