#1, stop using bait. I'm not saying bait isn't fun or productive or isn't for a specific species, but remember my comment above about stocked trout in cement ponds spending their time meandering around the swimming pool after recently being dumped in? When you fish bait for trout in a pond where they're constantly swimming around for a few days after being dumped in, you're essentially limiting yourself to the area where your bait has landed. By using jigs, spoons, wacky rigged Power Worms, or 'the latest hot lure that Pro-Staffers are pushing,' you are casting a wider net, (don't use a cast net, they are illegal, btw.) since your bait is presented in more areas than when you're sitting on the lawn chair chucking your inflated night crawler, which is getting bit on more by the pond's turtles than the fish.
#B, if your budget permits, get yourself something other than your Zebco spin cast rods and break out those Zebcos in other situations, perhaps when they stock catfish, (no offense to catfish) or when you're out on a date, and you can just leave it lying on the edge of the shoreline with a hunk of mackerel on the end, since you were occupied with other things. Plus if your date wants to cast it, they won't leave a huge backlash in your spin cast reel.
I remember those Zebco beauties...I didn't feel the bite until the fish had digested my entire rig and was pooping out my hook. You feel the bite days later.
Get yourself some better gear, it makes the learning curve for catching stockers a lot easier.
And, don't go out and spend a bunch of coin on some of these 400 dollar "mini jig special trout rods" either. That's like spending money on a carbon fiber fly swatter. Get yourself a reputable Daiwa or Shimano 6'6 or 7 foot rod on sale somewhere that'll do the job, and drop $40 on a 1000 sized spinning reel, something that'll give you 100 yards of 4 pound test on the spool will suffice. Bigger bonus if it comes with an extra spool, because that way you can put 6# and it can double up as a rod for bass or cats.
I mean, everybody has great memories growing up with the Zebco spin cast rods, catching bluegill or bullheads off the dock with grandad, but you've graduated to chasing these elusive stocker trout. You will definitely need the right tools for the job.
#4. You'll hear this a lot when asking for fishing advice.
"It depends."
To make a long paragraph short, let's just say that if you're fishing a cement pond where you can merge on a major freeway within 5 minutes of your location, odds are that the pond isn't that deep. There's no need for a 3 foot leader. Might as well fly line the ball of Power Bait and wait for them to start feeding on the surface. I would start at a foot and a half and work my way down from there.
But remember #1 above. It'll make you a better fisherman in the long run.