"Plant elbow" isn't what I've heard it called, but it's basically the same thing.
Drop the mag as you pull the gun in. Brace your Bicep against your Pec, so that the strong arm is braced against your body, and the guns about a foot from your chest, then as soon as the mag clears, tilt the gun so the magwell is oriented correctly - it's directly in the path of the incoming magazine, and you won't have to bend your weak wrist to insert it. Straight shot from belt to magwell.
Grab the magazine with you weak hand (index finger-tip on the nose of the first round in the mag, of course). Pull it from your mag pouch, and while keeping the finger pointed so that you whole weak-arm is a straight line from elbow-to-fingertip, feed the magazine smoothly into the gun by aiming the fingertip of your index finger at the middle knuckle of the pinkie that's holding the gun.
The dot trick helped me a lot, too. (Paint a white dot on the inside of the magwell and stare at it while loading). Don't watch magazine come up, stare at the magazine's destination. Your weak hand will bring it right where you're looking every time. Just trust your body. It knows how to run the gun better than you do.
Just keep thinking "SHUT UP BRAIN! LET ME DO THIS!"