What to spend myth tomes on PLD for coil

So right now I have all of my attributes set to VIT, sittin at 5534 not in party with no buff.

I have relic + 1 weapon/shield already. I can craft a 2 star item as I have peacock ore for rose gold jewelry, so that is an option to replace my hoplite ring.

I have every darklight except for one ring, the hoplite. I am wondering what my first purchase of myth should be. I am not entirely worried about absolute BIS, but it would be nice.

Turn 1 drops a chest piece right? So I was thinking that I should buy the myth head piece since the allagan head drops on turn 4. However, I actually have to see the chest piece and win it from the other tank in the group on T1.

A ring drops on turn 2 in coil, however I could use the coil allagan ring and the myth ring so that both of my rings are beast. But then if I get my chest piece in turn 1, Ill be pissed bc then I have to start saving all over again for head piece.

Im going in circles. What do you experienced tanks suggest?

Sorry this is a bit convoluted I am rushing to type this all, im on my way to work, and had to delete some of my thread bc it was too long. Long story short, just wondering what you experienced tanks spent your myth on first, aside from relic + 1.

I've been using my Myth to fill in gaps in my gear after picking up pieces from Coil.

So far I've gone in this order:

Relic+1 > Valor Coronet > Valor Leggings

Will most likely be getting Valor Gauntlets on Monday, that or the Myth ring, still not sure yet.

Others will argue that you should go for the "BiS" pieces such as Valor Surcoat, but I don't see much difference between the two bodies. That doesn't mean I won't get it and use it eventually, just not a priority for me right now.