Ok, here's my feedback (blunt but hopefully constructive

haha)
* 5-man bike squads are good, but get as much grav as you can: add combi-grav and melta bomb
* Why put sniper scouts combat squadded and then half in the landspeeder storm? If you are gonna use scouts in the land speeder, optimize on it's open top feature by taking bolter scouts or close combat scouts; heavy flamer is good on this though.
* I don't understand forcing yourself to combat squad the
tac marines b/c of their razorback transport... 5 marines alone usually just ends poorly, and if you're planning on walking them on, might as well use a cheaper troop choice like bolter scouts. I'd stick to 5 in the razorback if you're taking a razorback, otherwise make it 10 in a rhino with matching ranged plasma/combi-plasma
* Assault marines won't make back their points, or provide nearly enough impact to justify taking them in this case. They are useful when you need to get that "extra pod" to get to an odd number; then take 5 with 2 flamers to be most effective.
* Stormtalons are great, skyhammers are the proper load-out I feel for their job; you probably won't be shooting at Wraithknights with them (T8) so you should be fine with 3x S7 shots rather than 2x S8
* Unlike the in-your-face Khan list, you don't really have any major threats in this list to be honest. I'd either go all-in on the centurions and get 4-6 with grav, go with Tigurius for Gate then divination, and Chapter Master (on foot though to tank wounds, you don't want him on a bike because then he can be focus-fired out of the squad) and use the rest of your force to just pick off objectives. Personally I would do something like this:
Tigurius
Chapter Master - terminator armor (so he can use his orbital bombardment whenever they gate/move, etc.), shield eternal, power fist, auspex
Scout Squad - 5x bolter, camo cloaks, land speeder storm w/heavy flamer
Tactical Squad - 8x bolter, plasma, combi-plasma, rhino
Tactical Squad - 8x bolter, plasma, combi-plasma, rhino
Bike Squad - 2x bolter, 2x grav, combi-grav, melta bomb
Stormtalon - skyhammers
Stormtalon - skyhammers
Centurion Devastators - 4x grav cannon/
amp, hurricane bolters, omni-scope
TFC
TFC
Lemme know what you think!