With the rune priest, you could choose one to select divination powers, to gain prescience and maybe forewarning, join him with the longs fangs on the aegis line and have fun shooting. The other rune priest, i would remomend you to put it on
TDA, because of jaww you gonna need it on the front lines and the 5++ is a good idea (i know, it isnt 3++, but is better than nothing). you could choose another power instead of living lighting, if you join him with grey hunters, you could use storm caller to get a mobile 5+ cover save, is just an option
For the elites, i love to use wolfguard on
TDA, i feel they make a better work than a dreadnought, you want assault cannon, you got it, you need more dakka, you can give them combi bolters, just picture this, an assault cannon and 4 combi plasmas droping on a drop pod behind enemy lines, epic troll for sure

, or just for fun and more troll epicness, agains any infantry army, pum 4 combi-flamer and one heavy flamer, i dontk thik that anything going to survive a ton of wounds, even 2+ going to suffer.
One lone wolf is more than enought, why? because they are slow, they need to borrow the transport for some other unit, that reduce their mobility, so the best is to have one and depploy it in an strategic place, his place is near
MC and vehicles and always away from big units, like
ig or ork boyz, but bring one to the table, the configuration you gave him is a good one still.
As was tell before, keep the grey hunters with the same pair of weapons, this way you could make different settings and give them different roles on the battlefield, you want to hunt
MC, use 2 plasma rifles, you want to take down a unit of infantry, 2 flamers are the best tool, you are facing heavy vehicles, the 2 meltas are the way, in this way you could customaze your grey hunter unit, and if oyu want a more
cc them, give them a power weapon or a powr fist, couple with the mark of the wulfen, here the must have is the wolf standard.
The long fangs, well what i can said about them, they are a good choice always, not a must have but a good choice.
Just to finish, if you want more C&C oriented army use
TWC, givi it a try, a unit of three with two
ss and one power fist it´s crazy when they reach the enemy lines