I'd also suggest that you utilize the Search and Archives functions here on this forum and look for mole trapping advice. Copy and paste questions/advice that pertain to you for future reference. Also, Google "The Mighty Mole Trappers Thread/ADC Forum/Trapperman Forum" for some great pro advice on mole trapping.
Moles in southern climates are gonna throw less mounds than in other parts of their range. Of course, the dirt has to go somewhere when they are digging their deeper dens or when the insects they're after go deeper in the soil due to colder or hotter weather, thus the mounds. I enjoy exploring mole mounds looking for these deeper tunnels and is where I exclusively use the Albano's Trapline Mole Trap upside down. Otherwise, I have better luck trapping moles on their surface/feeding runs (raised ridges on top of the soil) using the upgraded OOS or Talpex scissor tarps.
Study the zig zag runs you mention and trap there only as a last resort. Somewhere there's a straighter run leading to or from the zig zags, either to the base of a tree, flowerbed, foundation wall, fence, driveway, or sidewalk. That's where you need to focus your trapping efforts on!!! Good luck!