I'd stop snooping, if I were you. I'm not sure what you're doing or how you're doing it, but some of that stuff is illegal, and it's a bit too close to stalking for my comfort. How would you like it if he were doing that to YOU? Checking up to see what's going on in your personal life? I know you think you have a good reason, but he might have reasons that sound good to him.
Your snooping won't get you any closer to collecting child support. It's only got your mind churning.
If he loses his job, the court will still impute income to him. The arrears will accrue until he's able to make payments.
So knock off the snooping--you'll be better off for it.