Business Visa - B1

Hi everyone,

I have my B1 visa interview in Kolkata in 2 weeks. I was in the US until this January on a F-1 Visa for 4 years (Studies + OPT). During that time a startup applied for my O-1 visa but it got rejected. I came back to India before my OPT expired.

I just recently started a startup in India( 2 months) in a speciality field and so I have been in touch with two major companies(Over $200M funds raised by them) in the US with whom we would like to a sign a partnership agreement and technology share agreement for local deployment in India. I have been invited by the company's CEOs to meet them and their team in California for the purpose. I am also planning to attend a once a year conference for industry experts during that time (Got ticket for it).

Duration of visit: 6 days
Trip sponsor: Me (Later reimbursed by my company)
Status: Unmarried, Have a local property in my name.
Income tax or other recent filings: None since I was in the US.
Current Salary: 1Lakh / month (Starting this month)
Current personal bank balance: ~5 Lakhs

Other docs I have: New company incorporation docs, 10 months office lease docs, Invitation letters, Conference tickets, My business card, Complete Itinerary for 6 days.

Areas I am worried about:
1. Rejected O-1
2. Only been back in India for 4 months.
3. Lack of IT returns.
4. Unmarried status etc.

I would like to get the community's guidance on how to convincingly convey my reasoning for the B1 during the interview and that my visit is for genuine reasons after which I'll return back to India for my startup.

Thanks a lot!