Nice list but you can drop the shifting stones for 2x more war wolves. The shifting stones aren't need here for anything they do. The extra war wolves though give you some serious punch when you start to trigger gang on the sic'em charge.
As another alternative you can put in the reeve hunter solo which can dash through your front line to kill jamming models and then sprint back through to safety. Its awesome when it works. If you do go this route then you can also drop the gallows for a second war wolf.
This is how I personally like to run Grayle in Wild Hunt:
Circle Army - 75 / 75 points
[Theme] The Wild Hunt
(Grayle 1) Grayle the Farstrider [+29]
- Warpwolf Stalker [19]
- Wild Argus [7]
Reeve Hunter [4]
War Wolf [2]
War Wolf [2]
War Wolf [2]
Wolf Lord Morraig [8]
Reeves of Orboros (max) [16]
- Reeve of Orboros Chieftain & Standard [0(4)]
Warpborn Skinwalkers (max) [15]
- Warpborn Skinwalker Alpha [0(4)]
Wolves of Orboros (max) [11]
- Wolves of Orboros Chieftain & Standard [0(4)]
Wolves of Orboros (max) [11]
- Wolves of Orboros Chieftain & Standard [4]
Alternative if you're feeling like going outside of wild hunt:
Circle Army - 75 / 75 points
[Theme] The Devourer's Host
(Grayle 1) Grayle the Farstrider [+29]
- Argus Moonhound [6]
- Warpwolf Stalker [19]
- Warpwolf Stalker [19]
Bloodweaver Night Witch [0(4)]
Tharn Ravager Shaman [0(5)]
Tharn Ravager White Mane [0(5)]
Tharn Ravager White Mane [5]
Tharn Blood Pack (max) [18]
Tharn Bloodtrackers (max) [16]
Tharn Ravagers (max) [16]
- Tharn Ravager Chieftain [5]