Flags are heavily influenced by wind, it is one of their most famous characteristics.
This means that a stiff breeze is A Good Thing if you are saluting the flag of your nation with a tear in your eye and with bagpipes tooting mournfully in the background, because otherwise it will just sag limply from the flagpole puncturing the emotional gravitas of the scene.
HOWEVER if you wish to manipulate a flag in geometric patterns then wind is a Pain In The Arse. Heavier flags are less influenced by wind, but they are also heavier which is kinda lame.
If you do NEED to spin flags in the wind, perhaps due to some kind of wager, or forfeit, then i would suggest making sure your planes are aligned with the wind, rather than being perpendicular to it, as shown in this useful diagram:

Flags are prone to twisting and tangling, i've found that spinning them in isolated circles is good for untangling, although it has to be in the correct direction or it will just twist up even more.
Those crystal poi do not look like they would have trouble with wind, but i am not fully privy to the secrets of crystals and their mystic vibration so i cannot say for sure. i also know nothing of THE FLOWMASS other than i find its presence sinister and unsettling.