My advice for you :
1. make filesize earn from 100 to 250 MB and 250-500 MB
2. try to escape by spam countries , especially from Group C: Romania , Bulgaria , Sierra Leone , Poland , Hong Kong , Kuwait , Malaysia and move them in group D , to avoid much downloads from these countries and no sales , especially from Romania
3. reduce PPD for D countries and increase for A and B countries .
My advice for you :
1. make filesize earn from 100 to 250 MB and 250-500 MB
2. try to escape by spam countries , especially from Group C: Romania , Bulgaria , Sierra Leone , Poland , Hong Kong , Kuwait , Malaysia and move them in group D , to avoid much downloads from these countries and no sales , especially from Romania
3. reduce PPD for D countries and increase for A and B countries .