My selection is close to be ready, in the meantime here is the basic setup Im using.
First of all Im using the Tamron Lens, it's my only "modern" Macro lens and it's an amazing lens, actually it was the first lens I bought after my K20D and the kit lens. It's my oldest lens, she deserve some respect
To trigger the Godox AD200 flash, Im using the Cactus V6 II that allows HSS sync, and Im using the Godox FT16 to control the flash power.
You will see in the pics below my Flash placement on the tripod, with a diffuser.
My idea is to have the flash to illuminate only the area I want to shoot, not the surroundings, and I want the background to be dark.
Usually the flash is 30 to 70 cm from the flower and it is set between 1/128 and 1/32 power.
My first goal is to have the flash light to illuminate only the tip of the subject, I use the Flash power to control the area of brightness (once set I dont move the tripod) when my camera shutter speed is set to 1/250, my minimum shutter speed because of the wind.
From now on I raise my shutter speed until the subject is underexposed by 1 stop approx, this give me a fully dark surrounding area and a slightly underexposed flower.
On the shot below my Shutter speed is 1/400, which was a minimum considereing the wind, I made most of my shots at 1/640 on that day.
All this is mainly guessing because I dont have any posemetre to measure the light.
I was using AF to get the basic focus then manual focus via Quickshift feature of this lens. Most of the time I was very close to minimum focusing distance (not on this shot though).