do you guys use swivels to prevent line twists. Also what size rooster tails do you use for bass. Colors too.

Personally, I have never had any trouble with line twist like others do. So I never use a swivel.

The main color I use when fishing for creek smallies is the classic silver with white tail. I might go with the Chartruese depending on water clarity.

I like to use the Super Rooster Tail 1/8th in black.

I fish Roostertails quite a bit. The bass in my avatar was caught on a 3/8 oz chartreuse Roostertail.

I use ball bearing snap-swivels with these. For colors, I use chartreuse, black, white, firetiger, and yellow - changing colors depending on water clarity and light conditions. For bass, I've used 1/6, 1/4, and 3/8 oz.

Regarding line twist, you can mitigate potential twist by bending the line tie at an angle a bit. If you have a problem with the blade "stalling", you can put a slight bend in the tip of the blade to get more action. See the photo.