There was a long thread about this several years ago, but I can't find it with the Search feature anymore.
I found that there are several things that are really important.
First, keeping the two sections pretty close to the same length.
Second, bottom weighting both sections so they fall truly level, and at exactly the same rate.
Third, having really free moving hinges.
Fourth, for me, having a relatively flat sided bait.
Fifth, having a slow sink overall, so you can work the bait at slow speeds without it sinking too deep.
These things were passed to me by other members here at TU, and they work.
When I wanted to make a glide bait, I bought an S Swimmer, to give me a better idea of what to shoot for.