Loop, I had incredible results with stocking the tilapia in my 1/2 pond as you can see from my
Tilapia grow out tank thread. My pond did not, and has never had the amount algae that you have. I also stocked at least 3 or 4 times as many pounds of tilapia as you. I also have 2 grass carp and had a bumper crop of tadpoles this spring that I believe contributed to the outstanding results. Probably 300 to 400 of the tilapia I stocked were only about 2" long. I rarely see any of this size now because most have been eaten but this huge quantity may have contributed to getting the algae under control initially and now the larger tilapia are maintaining control. I admit that I did not have much faith in these fish in the beginning so I had a jug of Cutrine on the shelf, just in case (our tractor supply store always runs out just when you need it). The jug still sits, but I won't hesitate using it if things get out of control. If I was in your situation I would probably give the algae an application on at least half of the pond and see if the tilapia can take care of the rest.
