Specificity with referrals is definitely the way to go. I'd make one minor change to Step 4 - instead of "And are there any other investors you can think of th

Specificity with referrals is definitely the way to go. I'd make one minor change to Step 4 - instead of "And are there any other investors you can think of that I should be talking to?" (which is a closed question, easily answered "No" without a lot of thought) try asking "Which other investors can you think of that I should be talking to?" They can still reply "No, your list is great", but the open question prompts their mind to find an answer, which is more likely to lead you to another investor who could match but you didn't know about before.