Here is the story with Guasti. 7 years ago it was one of my go too lakes. They only stocked the big one then more or less. It was great back then because they stocked it at the East end of the lake and the catfish would bleed out from there. (Good fishing) Then some knucklehead got the dumb idea to stock it in the middle of the lake by the fishing pier. (structure) Can you guess where most of the catfish swam too??? Yep right under the pier and they were hard to catch. So I wrote that lake off for years. Last year at this time out of desperation I gave it 1 last try. (the parks weren't very good to me at all) Low and behold when we got there, we found they stocked a small percentage of the plant in the small lake every week. 200 pounds go in the small lake and 600 pounds goes in the big lake. Yes they still swim under the pier, so that's why they stock both lakes now. So we gave it a try on Thursday afternoon. (day of the plant) As I reported in my report, we are fishing for suicidal fish on Thursday afternoon. Yes the fishing is good then but probably only in the small lake on Thursday afternoon. So any other time I wouldn't recommend it.
Pond catfishing is all about strategy. If you can figure it out it's great, if you can't it sucks. Since you have a son the Kids derby's are one way to go. There was a gentlemen name Geateam or something, he would post on here all about fishing the kids catfish derby's. He simply killed it!!! Look him up by going back a year or 2 in the city park section. You'll learn a lot!