I live in Tennessee and we have some good smallmouth on my home lake. I live about 2-3 hours from the legendary Dale Hollow Lake.

I have never attempt to catch a smallmouth on my lake and now I plan to change that.

I bought a 6'8 Medium extra fast St. Croix Mojo spinning rod. Got a Sedonna 2500 spinning reel with 6# yo-zuri line on it.

I plan to switch out between Shaky heads and a small tube. I'm use a E-z weight inside the tubes.

I got lot of bluffs and rocky banks on my lake. How should I present those two lures and what type of weather conditions is perfect to fool a bronzeback on my lake?

Dale Hollow is probably the best SM lake in the country... The world record came out of there!  

The rod & reel combo you list here is just fine. However, I hope your line selection is a fluorocarbon? They keep the belly out of your line, maintaining a more direct contact with your presentation. Plus fluorocarbon is a harder line than mono, consequently the "perceived" line stretch is much less, usually resulting in a higher percentage of hook-sets. (JMO)

Why do you want to go with a "small tube"? You can do that, but I think you might be better off with a 4" tube, if the tube size you are referring to as "small" is 3" or less. Make sure you get some in watermelon & green pumpkin colors. I'd also recommend internal jig heads for more open water conditions, or if you are fishing snaggy stuff, use the EZ-Weights (internal) with a texas worm hook. Let your lure fall to the bottom. Let it set for a bit (vary this time according to the fishes mood). Then twitch it off the bottom and/or drag it along. Again, try various retrieves, but keep it on the bottom as much as possible. You'll get bit!

Finally, don't over a LC Pointer or X-Rap suspending, hard jerkbaits.

Just listen to Crestliner!