Depends how long you need them to survive. Spirits are fine just 1 pointed imo as you can spam them much like 1 point blades. For trash tanking then i'd max dires, ou can cast them less often and leaves you free to go about your business.
grizzly ->damage to dires and spirits
dires -> damage to grizzly
spirits ->ar and def to dires and grizzly.
I don't bother with buffing summons damage unless you need them for damage. IM will destroy grizzly in 1 shot for example.
I dont really use them for tanking, I use them more to split mobs up, Ie. cast one to one side of the screen and another to the other side so I don't get swamped or to draw ranged attacks.
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