Doug,
You might try using the little rubber bands that are on braces and put them around each of the holders... I've known guys to do that and it seemed to work effectively...
I had the same issue and tried the lower holder you showed and it seemed to want to hold the arrows to close to the limb and the feathers would rub... they also didn't stagger the arrows as effectively...
Jonathan
PS I don't have any Selways anymore... if you want to try it PM me an address and I'll try and get it out the first of the week...