So after giving up on LastPass because it is not e10 multiprocessor compatible, I have been trying to sync my bookmarks using Firefox Sync, Chrome Sync and iCloud Bookmark Sync for windows. Unfortunately iCloud bookmarks is garbage, because it has no simple way to either clear bookmarks, or force a sync from a single source, and unfortunately it often gets completely corrupted! To clear it you have to disable sync everywhere except your mac, and let it sit, then clear your bookmarks and either import or create a new clean set. Unforunately this process is very unstable. It requires much switching off sync and waiting, and hoping.
Keep your fingers crossed, as I am.