I've played this build, with Holy Tactician Paladin 3 to give everyone
Skald's Vigor should be giving you Fast Healing 8. That's how I played it, but expect table variation.
I don't think Raging Vitality works with your Raging Song, sice it's a Bardic Performance, not barbarian rage. You'd need something like Lingering Performance, since it will extend the performance.
Fast Healer probably doesn't boost Skald's Vigor. This is just asking for an extended rules debate, I wouldn't take it.
You can't stack Improved Familiar and Valet. Which is fine, because you can't take Improved Familiar with a Tumor familiar anyway.
Full Attack Looks right.
Yes, Raging Song counts as Raging and Furious is awesome.
Other advice:
You can take a Bloodline familiar and save a feat. This also lets you get a Goat familiar, or a (non-Valet) Improved Familiar later on. An 18 Str Goat is a real combatant at level 2.
Eventually, you can consider Eldritch Guardian Fighter (with a Ring of Tactical Precision for your buddy) instead of Bloodrager. I've ended up at Skald 12/Eldritch Guardian 2 with a Fauchard-wielding Fire Mephit Familiar.
I would take Unexpected Strike as your third Rage Power. Swift foot is a tiny bonus. Giving everyone in your party AoOs is awesome. I'm also not sold on Fiend Totem (or Lesser) but I assume that's part of your theme. I had a lot of luck with Lesser Spirit Totem, and then Strength Surge + Savage Dirty Trick.
You're still a Two-handed melee Combatant: I would get Power Attack in there, I guess at 7th. As Mentioned, I don't think Raging Vitality works, but you could swap to Lingering Performance. Community Minded is a great trait, and kind of a mini-Raging Vitality and Lingering Performance.
If you're still worried about Raging Vitality, Fervor Juice is cheap and awesome.
Fighting Frenzy isn't getting you much. Your defense isn't AC: it's Mirror Image, HP, and Fast Healing.
IMHO, it's worth retraining into Greater Skald's Vigor at 10th, it's that huge.
Battle Song of the People's Revolt for Improved Spell Sharing will double your self buffs with your familiar. You'll need 4 ranks of Perform(Percussion or Winds) so plan those in. There are a couple of others that are worth having (Stealth Synergy can make a group reasonably stealthy, Lookout makes for awesome ambushes if you know you have surprise.)
Never forget Spell Kenning, it's insanely flexible. Restoration, Fly, Invisibility Sphere, Invisibility Purge, if you hit a wall, Spell Kenning can probably get past it.
Exquisite Accompaniment + a Lesser Extend Rod is a group heal for 80 at 10th.
Take Flexible Fury and make sure you know your options for Rage Powers. Giving everyone Lesser Celestial Bloodline (Melee attacks count as good aligned, +1d6 vs Evil Outsiders) or Ghost Rager (full damage vs Incorporeal) will turn around fights that would have been painful slogs.
Echolocation, split with your familiar, is a sweet buff.
