Well I hate to be the bearer of bad news, but I ran some more tests this week. There is some good news too though.
The good news is that I found that Store TP seems to be calculated the same way here as retail.
The bad news is that an Ebow Rng /Nin or War requires 14 STP just to achieve a 7-hit build
and
33 Store TP for a 6 hit build. Quite the farcry from in era retail x-hit builds. I don't think a 6-hit build is actually feasible to use on this server in Ranger's current state, and it's just flat out not possible as /Nin or War without a Corsair in your party using Sam Roll.
Ontop of being required to sub Samurai you would need to use:
Mekki Shakki (5)
Rajas Ring (5)
Enkidu's leggings (5)
Brutal or Attila's earring (1)
Almah Torque (2)
at a minimum without outside Cor buffs or food.
I'm not quite sure if the loss of multiple slots just for Store TP is worth it. Either way, it's a bit absurd that we need to go to such lengths just to have a normal TP/hit ratio. 126 TP a hit is something you would expect from a level 15 job in the dunes, not a 75 Ranger with a long delay weapon. 8 hits to 1000 TP for any two-handers feels like shit regardless of the job; Only, Rng doesn't get haste/flurry, or velocity shot to make up for it.
Just to heck around I went ahead and tested the delay for the bow as well.
Following this formula:
Source:
http://ffxiclopedia.wikia.com/wiki/DelayThe expected value for Ebow(not counting ammo delay) 0 Snapshot merits from nocking the arrow to the moment it leaves the bow is:
490/110 = 4.45 seconds
However after analyzing it frame by frame:
https://streamable.com/108n4it comes out to about 5.233 seconds. Which is basically the correct value if you
INCLUDE ammo delay in the equation.
580/110 = 5.27 seconds
So only ammo delay's negatives are being factored into Ranger's TP phase currently.