Counting the crafted accessories, all the accessories I've been using for T13 clears have Vit on them. Ideally I'd like to replace one Vit accessory with another Crafted accessory, and then swap out one Vit Acc for a Str accessory, so the total would be 3 crafted, 1 STR, 1 Vit.
Thing is, that while it's getting better both of our clears so far have been running up against the Enrage timer, and we've had a few runs that would've been clears if we'd had just a little more DPS to get down the last percentile or two. So, yeah, there's a lot to be said for not taking chances with Morns, but another 15-20DPS can also be the difference between a 1-2% wipe and a clear.
PS: and yeah, they use HG once in the first phase, and we burn the first LB for a small chunk of additional damage during the transition into second phase.
PPS: I have a large chunk of the more expensive mats to make said accessory. Only reason I don't jump into it whole hog is because of the Materia. Though, thinking about it, I suspect at least Vit 4's have dropped since I last pentamelded an accessory, as people aren't really doing progression anymore.