Welcome to Medusa! While your list feels fluffy, it's not very optimized.
Some quick thoughts:
HQ
Master of the Forge, bike, 110
Techmarine (in tac squad), 50
The MoF isn't bringing much to this list. Iron Hands benefit from being able to bring SmashX. That is, a captain or
CM on a bike with either Shield Eternal or Gorgon's Chain. This results in a Thunder Hammer wielding, 2+ artificer save, 3++, Eternal Warrior, 5, 4, or even 3+
FNP warlord who absolutely murders anything he touches and is virtually impossible to kill. Consider this.
Tactical squad, 6 marines, grav gun, razorback (twin-linked assault cannon)
Tactical squad, 6 marines, bolters, sergeant with power weapon, razorback (twin-linked assault cannon)
Tactical squad, 6 marines, heavy bolter, razorback (twin-linked assault cannon)
Tactical squad, 5 marines, flamer, razorback (twin-linked lascannon),
Grav Guns don't pair well with tactical marines, you simply move too much. Leave them for bikers. I tried running a very similar list with Razorback spam at one point, but it simply isn't an effective build. Consider swapping two to rhinos, running 2x 10 man squads and then a scout sniper squad. This should free up a good number of points for you to do some more fun things with. That would also give you more scoring units. With combat squads, you'd have 5 using 2 10 mans and a scout squad. They'd also be just about as durable as your Razorback marines are right now.
Fast Attack 280pts
Storm talon, twin-linked lascannon, 140
Storm talon, twin-linked lascannon, 140
I run mine with Skyhammer Missile Launchers, but the
TL Lascannon option is a good one. Stick with this.
Vindicator, 125
Vindicator, 125
Predator, 3 lascannons, 140
This is a tough one. Vindicators need to be run in pairs, and I like them. Predators are okay - consider an Iron Clad with dual heavy flamers in a drop pod if you go with the above suggestions. If you use the Raukaan supplement, which you should consider, you can take them as
HS w/o a
MoTF. It's an awesome unit and causes some serious backfield panic. I LIKE my tri-las predator, but it's not the best thing in the game and other units might do the job better, and your list has no shortage of las cannons.