The all catching Tube-n-Worm question

[wahlie]

Gents,
I started fishing from a kayak last season. I do 95% of my fishing from the surf. I figured it would provide a great opportunity to get to fish that are otherwise out of reach from shore. That being said, I tried out the tube-n-worm rig with minimal results. I would go entire nights and fish nothing but the t-n-w. My question is how do I know if i'm going too fast and if my t-n-w is running at the proper depth? Any advice would be greatly appreciated. I've done my research but think that I just need a first hand expierience on this.

Thanks,
Chris