Sorry for being so hard on you. I'm not trying to use the Death Company for anything accept cover & a target for my opponent shoot at. I want them to run at the enemy & die they will buy me a turn or two so I can hit where it counts with what I have to slow down my opponent.
The Honor Guard will be worth their points, I have used them before & had tremendous luck with them. The assault marines will not need jump packs in this list & will give me a discount on the Land Raiders, & I will be able to play the rope' de' dope, where I use the two assault squads together to support each other. If one squad can't sweep advance the other can. I can't be all over the table at the same time, but if I concentrate on Attack & Defend; loose what I can loose I will be fine. I also use the old OOP land raiders modified with current weapons so I will have a smaller Deep Strike area.This will allow a more effect troop placement, so Extra Armour is a waste of points for my army. I'll still be able to shoot a weapon system & I should be in a position to make it count & unload my troops where I need them to be. The Razorback is a bit out of place but can block LOS for the Dred if needed & add to flamer defense options for horde armies. I agree with you the Devastators are small & I would like to take a full squad but 80 points I don't have to spare on a unit that is for all purposes expendable.
From all this I will most likely run this list for play testing with two additional Scouts. Elements of this list may surprise.