Mine's formatted like this:
Interface -> AddOns -> Skada -> Columns -> Damage, check which ones you want to show. I use Damage and DPS, cause I don't care about the % of damage someone does. I've been thinking of hiding DPS aswell, because there's a separate window for that anyway. I can just right click Skada, choose DPS and it'll show me that information. It feels redundant showing it on two tabs but I'm too lazy to fix it.
You can move them via your SavedVariables, if you go in your Bartender.lua inside your SavedVariables folder, you'll see a table containing all your settings. They'll probably be sorted by profiles first, so find which one you use, under that you'll see your settings for that profile. You'll want to find the bars in question. Chances are they're called "bar1" and "bar2" etc.
There'll be position settings in there somewhere, and you can just increase the value by 1. You don't want to move it by 0.5 pixels, that can cause problems with border thickness and blurry textures. DBM, for example, is notorious for screwing up borders because of this. Try moving it a full pixel and see how it looks. It's worth trying atleast.
Unless that's what you meant by "in lua", if you've already gone through the SavedVariables I can't help you because I don't use Bartender, my advice follows the "shoot and hope it sticks"-logic.