How to customize simulated cloth

I’ve been trying to create a vertical banner (1.4 x 3.3m (width x height)) that moves with wind, and watched/read every online tutorial I could find, except whatever I made didn’t seem to move as much even with the Wind Directional Source added. So I tried to adapt the Simple Cloth Silk as it had the right movement, changing it’s height in blender by a scale of two, except when I reimported it, the top half seems to be flapping.

Please help! I really took thorough look at the online tutorials but they’re not quite the same, and I’m lacking the knowledge to be able to adapt them to create what I need. Thanks!

Another attempt at customizing the cloth, lead to a a limited

amount it could be blown by, see picture below: