Darian,
Stick with it, lampreys work great everywhere. As for color and material, I really like grey bunny strips with a cone head. Use as long a strip as you can find. The cone head really creates a nice swimming action with the bunny pulsing along behind. Purple is another good color. I also tie in two strands of Krystal flash right behind the conehead. Keep the colors subtle. Only a little is plenty. I use this to maybe add just a little attraction.

I've tried tying these larger with tanden hooks sort of like tying a barracuda fly but I loose the wiggle of the bunny tail. Gotta have that wiggle.

A while back in Fly Fishing Saltwater magazine there was a pattern a guy tied for the delta stripers that was almost a foot long. Naturally can't find the issue now.

See you out there,
TONY