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Is this unfluffy or stilted?
As ever, the 'fluffy' choice would be to base your army around a battle company, to whit:
- Tactical Formation
- Tactical Formation
- Devestator Formation
- Assault Formation
And then fill out the rest of your army as you like. The greater majority (like 90%) of Marine actions in the background consist of a battle company undertaking a mission, reinforced if nessesary with units from other companies, but always with a battle company as the core of the army.
That Tactical formations are only really useful as bodyguards for Supreme Commanders, and are not useful in their own right as a battle formation, is another failing of the list, of course.
You could make a respectable argument to say that your list is an 8th company army, as a decent number of your formations would use marines from that company (Assault, Assault, Land Speeder, Bike)... but it certainly isn't a 'typical' Marine army according to the background, as the 8th Company is normally used in support of a Battle Company, not the other way around.