Having been through this process once and hoping to never have to do it again - my sympathies. I have one piece of advice for next time. The visa interviewers

Having been through this process once and hoping to never have to do it again - my sympathies. I have one piece of advice for next time. The visa interviewers are usually rushed and trying to move on quickly. Slow them down and address their concerns. You response to Officer: You are too young to be CTO. Whatever you just said does not make any sense. How long is your visit? Answer: 1 month is not enough. The officer mentioned a concern but didn't phrase it as a question. Nevertheless you need to address it head on and put their doubts to rest. Give them the full story on it.