Wizard skills:
I’d drop Earthquake to 1 (at most…) and Quick Cast to 0. Quick Cast won’t effect any of your skills…at all, as far as I can tell (I don’t have a Thauma 3 or a Feather 3 yet but I’m pretty confident their skills don’t have cast times either.) I would highly recommend lethargy for the strike damage attribute for parties. Sleep is good, but you probably won’t get much use out of it except for sleeping mobs before you self destruct on them. I’d certainly rather have that then any points in Earthquake though.
I’d also consider maxing Surespell for quality of life. In a build like this, 5 skill points in Wizard is pretty cheap.
Thauma:
Looks pretty solid. I’d throw a point in Reversi for the fun of it, but otherwise I think the point placement is pretty obvious. Shrink Body will be a pretty big deal, especially at Feather 3, and without link killing swelled mobs will be a pain, so you’ve hit all the critical points.
Killing anything will be a pain in the ass until you make it to Rank 7 though. Better get there quick before the R9 patch comes and makes leveling difficult again 
Feather:
Blood Bath is honestly terrible. I got it level 1 on my FF and regret spending the one point in it. It’s funny to use it, but the damage is poor and the healing is negligible. You are better off having another point in Levitate. Kurdaitcha and Bone Pointing are good where they are.
I’d seriously consider dropping the points from Ngadhundi and putting them in Levitate. At R9 you will get an attribute that will increase your damage by 30% when Levitating, so having lots of time on that will be a big deal, and the extra damage from having Ngadhundi will be completely dwarfed by the absurd damage of Kundela Slash 10 with the double hit attribute. Decay is cool, but it doesn’t help you all that much, and it already has a duration equal to its CD at level 1, so I don’t think you’ll need the points in it.
Otherwise, obviously max Enervate and Kundela Slash. Blood Curse if you plan to use it a lot, but with a full int build your damage will probably be pretty lackluster. I might leave that at 5 and use the points to max Blood Sucking, to squeeze more out of its terrible CD. That will leave you with enough points to get Levitate 7, which is 44 seconds of +30% damage on a 65 second CD. I might actually drop three points from Blood Sucking to max Levitate, because FF damage stacking is lol.
As far as general comments, as plenty of people have mentioned you are going to have a rough time dealing with large mobs as your only real answers are Magic Missile and Blood Sucking. And as I mentioned before, leveling up to Featherfoot is going to be agonizing if you aren’t skipping the first six ranks with Instance Clears and 8x tomes. But you will have all the single target damage, especially once you hit FF3, and in most situations you will be able to easily sustain yourself with Blood Sucking. Your SP might hurt a bit once you start stacking up all the R9 attributes, but pots are cheap so it’s not that big a deal.
My FF is the standard 2/2/2/2(3) build, so I can’t say with certainty, but I suspect you will have an easy enough time with general PVE and missions, but you might have a bit of difficulty with the mobbiness of dungeons before you shred the boss. HG will also probably be a bit rough (you’ll probably have the damage to kill things, but if you are killing one at at a time your sustain might not be able to keep up). You’ll do fine in most parties with Shrink/the Swells/Lethargy if you get it to play basically as a support, not to mention Decay and Curse, on top of your damage.
Also I’d check to make sure your damage wouldn’t be better off with a Rod/Dagger, as the Swell Right buff will be pretty hefty. Not sure it’ll be enough to overtake a Regard Horn (especially with trans), but might be worth looking into.
