I found you need to spend a lot of time at the water with a pocket or two of bait, rather than a barrow full of gear.
Find em feed em then work out the angle of the dangle.
I had good results doing this sometimes an hour's fishing would give me a 60 + year old leney of close to 30 pounds.
This was a low stocked public lake of just over 50 acres.
I recently went to a commercial fishery while waiting for this year's tickets, and cought nothing lol.
I watched the end of my rods getting twanged about at morning bite time,and came to the conclusion that I was being done rig wise.
So these commercial fisheries although stocked with stupid amounts of fish (this one had 300 in 10 acres) they can be bloody hard to catch and hard on your pocket.