I would drop the Lone Wolf. I love them personally but on the rare occasions I do use mech lists find they get left behind. Without ablative wounds or cover from other infantry units they tend to die before I get to the enemy, but then my regular opponents really don't like them.
So I'd ditch the Lone Wolf, and use the points either to add a Chooser of the Slain and Twin-Linked Lascannon Razorback for the Long Fangs to the list.
Or you could use the points to add a Power Weapon to each Grey Hunter pack, a Chooser of the Slain and Wolf Tail Talisman to the Rune Priest, and Dozer Blades to each Rhino.
Overall, the list is pretty much what to expect from a stronger
SW mech list. 3-5 decent sized Grey Hunter packs with 1-3 Long Fangs providing support.
Oh, and I'd consider replacing Tempest's Wrath with Storm Caller. The cover extending from the Rhino he is in may do more to keep your army alive when you don't use
LL.