Feels like I am missing something

[Silverbane]

What do you think about this one?

Toil (300gp) > Unearth II (300gp) > Sharp Vision (100gp) > Gather x5 (at 37% chance) > Gather x1 (last hit HQ)

Figure this gives you x5 swings at 37% HQ chance and the last swing guarenteed HQ. The only downside i can see is that the sharp vision likely won't get you to 100% (probably 91-95%).

The 100GP Sharp Vision is SVII, and add 15% for me that's 100%.
As to whether to use Unearth II (UE2, 300GP) (+30% HQ) or Bountiful Yield (BY, 200GP). UE2 will give, average, 1.5 more HQ per node-spawn. BY will give you 1 more, every time, and costs less GP -- which is important even if you have 700GP for the UE2 rotation, because it takes an extra 20 Eorzaean minutes to recover the extra 100GP for UE2. But if you have the time and the GP, UE2 is better, on average, by 0.5 HQ per node-spawn.

Different people can rationally choose either option, depending on their situation and tolerance for risk.

[Lilyth]

snip

You forgot to add the extra +10% HQ chance of Unearth 1 (which you can use with 700 GP) in the comparison.
Either way, I'm too lazy to do the math myself, but I ve been consistently getting 3 HQs, or 4 when i get a little lucky, per node, so im pretty happy with it!

I also like to know that at least 2 items will be guaranteed HQ, even if RNG screws me over. But in pratical terms, both rotations are pretty solid. When I feel like gambling, I don't even use field mastery II and use that 100 GP somewhere else, lol.