I like the Google Earth view via WM as well, you can find 150 WM at a time. I'm using GSAK to store WM before I upload them to my GPSr. The cumbersome loading of a few WM via GPX made me think, is it not possible to save those WM views from Google and load them into GSAK. This resulted in two GSAK macro's. One to load KMZ / KML files into GSAK and one to post process this loading (and of GPX loading) and mark those as just-loaded, found or posted. I can now keep track on my posted, found and not-found WMs via GSAK.
Unfortunate you have no information about your found/posted WMs via Google Earth (GE). However, you can start with all your posted WM via your Profile page 'Waymark List'. Mark them as Posted. Then you have to load all your found WMs via GPX load unfortunate. When these two steps are finished you can add WMs via GE in sets of 150. Note that you keep the import option on not to change any already loaded WM (or Waymarks as called in GSAK).
The two macros can be found here WaymarkImportKMZ and WaymarkPostProcessLoadGpx.