RE: wind drift or too much powder????
If you really think it is the wind try this when you have time. Place small flags in the ground 5-10 ft apart all they way to your target and observe the wind patters and what way the wind is blowing. It may be calm in you location but windy half way to the target and then calm again or vice versa. I have even scene the flags blow in opposite directions when the wind starts swirling.
Basically you just have a friend watch the flags as you take aim. They tell you when the flags are not moving or as little movement as possible and you shoot when ready.
This takes some time but it is worth it, obviously it will not work on very windy days always try for a calm condition (under 10 mph if possible) where I live the wind is always blowing 10-15 MPH if not more. They are starting to put up wind farms!