Ambidextrosity is a distinct advantage and because it seems to be easy for you to attain you should pursue it.
Obviously you want to eventually match your left arm with your right. It's the same process all over learning to crawl first then walk then run. so first you need to be able to mirror your lefty from a stand still.
I only review the lefty because the righty will follow with practice when you mirror the lefty. As a control drive your form ain't too shabby. As a distance drive there is room to improve. You miss the pause. The leg follow through varies in where it lands. Did you intentionally want to go for different power levels in: http://www.youtube.com/watch?v=Qb-UnxzNzbw
You don't turn the waist or the shoulders to the left and miss a lot of power. You aren't really elbow forward. I'd also test different timings of the arm acceleration to see which one yields you the most distance now. Note that it may change when you gain power and condition your nervous system to be faster. So you should test each season. Can you pivot on the heel after landing on the toe then rolling onto the heel along the edge of the side and the bottom of the sole of the shoe? It is hard to tell what you use because you have flat footed shots and ball of the foot pivots and quarter heel pivot.
What is missing most out of long throws is oomph. Get going. Explosive acceleration in the legs, hips, shoulders and the arm. The arm is closest to where it needs to be out of those. What specifically do you want advice on? I'm not sure if it was distance or control.
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.