Looks good to me. Bobby G is going to be handing out re-rolls for days and the Razorbacks deal out the anti infantry firepower that the Fellblade lacks. There's only two things I'm not 100% sold on. Firstly Heavy Flamers on the Fellblade cost a lot of points but don't contribute damage until the enemy is well with charge range, I love me some auto-hitting solid overwatch potential but ideally is the Fellblade going to be that close to the enemy? Then there's the two tech marines, one is enough to keep the Fellblade topped up and you have enough points spare to replace one of them with Chief Librarian Tiguris who can buff the Fellblade up to a disgusting T10 with Might of Heroes.
You asked in the main tactics thread what lists I'd been running the Fellblade with so here they are-
Captain with Thunderhammer 99
Primaris Lt with Power Sword 74
Tactical Marines (5 Grav Cannon) 93
Tactical Marines (5 Grav Cannon) 93
Tactical Marines (5, Melta Gun) 82
Razorback(Assault Cannon,Stormbolter) 102
Razorback(Assault Cannon) 100
2x Eversor Assassins 140
Fellblade(FAC,Demolisher,2xQuad Las,Twin
HB) 717
Total=1500
Very similar approach to your list, a small mechanised force using Character Auras to make everything super effective in a tight bubble. My biggest deviation is going for the Eversor's because they do such wonders in the enemy backline and help cover the lists weaknesses in killing massed infantry. This is the list I'm taking to the tournament mainly because everything in it is build and painted to one degree or another
HQ-Captain w.Thunderhammer, Primaris LT with Sword
TROOPS-2x5 Man Tacticals(Grav),5 Scouts
+Relic Fellblade
Imperial Guard/Officio Assasinorum Vanguard-
HQ-Tempestor Prime
TROOPS-10 Scions(4 Plasma)
ELITES-2x Eversor, Scion Command(4 Plasma)
This is the other Fellblade list I've experimented with. It got rejected as it lacks too much Space Marine in an Astartes list and it would require very quick purchasing and painting pre tournament. The big thing for me was having 5 reserve drops before having to put a model on the table drastically opened up my deployment options as I could see where my opponent was committing to before putting my main force down. Going up to 2000 I'd mash these 2 lists together, aiming to throw in a Librarian for the silly Might of Heroes combo and some more sources of long ranged anti tank to reduce my dependence on the Fellblade to cover me in that aspect of the game.