Personally, I think longer pins are better because the pin should be over the fingers. If not, it'll have more of a tendency to clip a finger. But, because you're cutting out the flare, you might be OK.
I would kick out the CG as much as possible. The more you kick it, the more the backend though. The weight hole can be anywhere, but I would put it on your axis. This will give you more of an arc.
Be careful with this drilling though. If you hit a strip of oil, the ball may not hook at all on the back.
The more you stay behind the ball with this drilling, the less it will hook and/or more it will have a tendency to roll out. The more you turn the ball, the quicker and more it will hook. =:^D