I think that clgreen work only up to some DAG number. Now I mine on DAG #434 (4.48Gb).
And I use latest 21.8.1 driver. Maybe clgreen works only on several set of drivers.
clgreen is incompatible wit clkernel 3. clkernel 3 overrides clgreen.
I tried clgreen with all possible kernels - 1,2,3. Always miner shows that GPU ignores clgreen 1.