Those are some of my suggestions.
As with all suggestions take them with a grain of salt. I love
MotF but sometimes he doesn't fit in certain lists or with certain points cost. Heck play a few games with him swap him in and out, see how effective he can really be in certain situations.
Scouts can stay, they are a good scoring unit. As I said they just don't benefit from Vulkans rules as well as a
tac squad could.
In terms of Rhinos vs Razorbacks. That is up to you. If a rhino does not move, the multi-melta can fire out the hatch ( i forget the exact ruling of this but it's food for thought .) If you wanted to as well you could hoof one unit up the field and combat squat the other
tac squad into two razor backs. Granted it's 5 guys but it creates two scoring units. So the razorbacks are still of use! I just wish they came with a Multi-Melta option, but Lascannons are just as awesome!
Yes, combat squad the sternguard for a few reasons. As I said they will count as a single elite choice in force org. In return it opens up a slot for those terminators to slide in.
Use Vulcan with the Terminators. He is a
CC machine as are your terminators. You do not have to take a Land Raider if you do not want to. I recommend it because it is an assault vehicle. Which means a few things. People will focus fire on it. There is a draw back and bonus to this.
Draw back obviously being it could blow up and Vulcan and the Termies have to hoof it. The plus, the rest of your army has been ignored for the most part. So lite up everything with your meltas and flamers, then jump into combat and beat the snot out of everything. Heck it may give your Dread a fighting chance for survival!
While Predators are good, they just arent my favorite tanks out there. You should have enough anti tank in your army between all your meltas to really take out the annoying stuff. If you wanted to you could take a vindicator for some crowd control if you're playing a horde army, same thing with a thunder fire cannon. Like I said you have SO MANY OPTIONS. Again, as I said with
MotF. Play some games with the pred! See how it goes. Heck if your opponents are cool ask if you can count it as a vindicator and see how that goes. Give you a feel for different play styles.
I will say you have the mentality of a Salamanders player. Up close and personal. You want to smash and flame your way to the front line and then lock yourself in combat. While receiving support from you awesome guns.
Hope some of this helps, and don't mind me if I rambled on far too much.