I'd use psnstuff_ver_1.8 its computer app that downloads Full Ps3 and Psn games to your Pc in Package form.
Ftp to your Cfw Ps3 install the games\Dlc and Psn games.
And activate with Reactpsn,either by Pressing O For some Psn games,For Ps3 games\maps create a new user aa Run Reactpsn and Press X to activate the Games.
This is rough guide but I have managed to get 60+ Psn games and Rage,Dead space 2,Cod 5,Black Ops 1 & 2 Map packs to work on my cfw Ps3.
?????, ftp to PS3 internal files can be any size since ps3's files system allows it, external usb games can be over 4gb as long as there is no single file over 4gb since that is the limitation of FAT32, although there is a way round this but splitting the +4gb files into smaller chunks and then a file manager like multiman will reconstitute and cache just that split file on internal whilst keeping the rest on the USB.