Looking for some advice on how some of the Botanists here get 450 Collectability, I've been struggling to find a decent rotation for this based on my gear and level.

I'm a level 57 botanist with about ~430 perception, and about 560 GP.

Let's say I'm trying to harvest Cloud Bananas (L57) as a collectable. My goal is to harvest only ONE Cloud Banana with a collectability of 450.

My question is:
  • What is the minimum required perception to do this?
  • What is rotation that will most likely succeed to achieve that goal?

Right now I'm using FFXIVguild's BTN guide, which recommends I use:
Discerning Eye -> Methodical x2 -> Utmost Caution -> Methodical x2

(Which I've tried, but I'm about 50 short of the collectability goal).

Any help would be greatly appreciated.