I don't use suggested links. Instead, I use tags. Those make related hubs show on the right of your hub, with the added advantage of showing the actual titles of the hubs before people leave your hub to click on them.
If you publish your hub, check the list of related hubs on the right side of the screen. If you don't see a related hub, either yours or another hubber's, then you can add a link capsule to include those hubs.
Also, if you have another hub that's related, you might consider grouping that one with the one you're working on. Then each hub in the group with automatically show at the bottom of the page when the other hub is read.