WordPress Importer timing out

I’m using the WordPress importer to try to import 700+ blog posts, but cannot get it to complete successfully. It runs for a bit, creates some posts, then simply stops. No errors are thrown. No errors are found in error_log. I turned on debugging and no errors are found in debug.log. Despite the lack of PHP errors, I went ahead and increased the max_execution_time and max_input_time to 3600. I also bumped the memory_limit to 768M. Nothing is working, and I’m out of ideas. Any suggestions would be appreciated. Thanks!