Just to confirm, have you checked our Help Center article which has tips for videos taking a longer time to upload/stuck during upload: https://goo.gl/UU9m9U . Hope it helps.
Sorry to hear that you're still running into trouble. Please send a feedback report directly from YT with these steps: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything and use the details to investigate & fix issues.