seeing that twintania can 1 shot a full i90 vit geared warrior with 30 points on vit with a death sentence/ auto attack combo if she was not debuffed and tank failed to use cds or innerbeast. Id say stick with your vit gear. well geared you would have over 8600 health and thats prob not including food. Your big health pool can allow a healer to patch up a dps that may need some help ect. If you are not doing coils, feel free to just use your dps jewelry or use materia on the gryphonskin crafted jewelry.

I do coils with my blm. But i do tend to tank here n there , hm primals, ct, n hm dungeons. I do have 15 str and 15 vit and all my jewelry is crafted which gives me 60str over reg vit tanks yet still have 7600 health.