Hog hunting is very challenging.
Sometimes too many dogs will put pressure on a hog and it will break. If that happens cut back on the dogs and see if that will work. It could be one dog that puts the pressure on and causes the break. Also, another way to tell if you have hi pressure dogs is if you are always only baying one hog.
Sometimes you can have loose baying dogs but the hogs will not hold bay. This calls for rough cur dogs that will do all they can to stop a hog. You might want to run a RCD with the pack. You will need protection on your gritty dogs if you decide to hunt this way.
Either way the hogs will look for the thickest cover and that will slow the dogs down but not the hogs. So, don't feel too bad when you have a few dry runs. Every hog hunter has these. It just makes it that much better when you catch a few...