Hi aj.
I finally got chance to post a reply.
It sounds like we are both at the same level as I'm working on the same skills. Things can get really frantic when your overpowered though. As my smallest sail is a 6.2 I've found the high wind setting is alot more stable. I've also found that raising the boom slightly helps as well.

I'm also finding the board turns to wind and stalls when I take the rear strap. I think it's all about improving the stance.

What kit are you using?