what to use as Ring 2 as War?

[Gamemako]

2 gyrphonskin rings are better in every way than one each of Fending/Striking. If you want to stack Vit, use Hero/Allagan fending rings, for every other situation, double Gryphonskin rings is the only way to go.

Yeah, doesn't make any sense to go with +13 STR and +15 VIT when you could have +18 STR and +20 VIT from Gryphonskin, lol. You'd consider Allagan Ring of Fending at the cost of everything else, just because VIT happens to be a bit essential right now.

More health is always better for tanking, simply because the strength does not increase the healing by IB significantly enought o beat out the 450 hp gained.

I don't see that your support for the statement "more health is always better for tanking" has anything to do with that statement. You have not justified why you would want 450 HP over superior mitigation.