how do I reduce the amount of "other" on my ipad

Recently I had to restore my ipad to factory settings. I have all 25000 of my photos stored in the "photo" app on my mac and also have them synced to my ipad. After the restore I have being trying to put the photos back onto my ipad. I have tried adding everything at once but that freezes the ipad, so then I have tried a few times to add an album at a time. When I start this process "other" is less than 1 GB but some albums can add 4GB of other. Never the same album so impossible to figure out why and some albums refuse to load, never getting past step 1 waiting for sync to start. Does anyone know a way to get this extra annoying "other" back to a manageable level.