I think it is important for you to understand that you might not always be correct in your vibes about the unknown person. You may be picking up things that are not indicative of the person's true character.
My niece has Moon in Cancer in the 1st. Sometimes her intuition is spot on. But sometimes she is picking up things that cloud her judgment. And she can be pretty stubborn if someone tries to change her opinion, lol
For example, she almost passed on dating her 'now' husband, because she got 'bad vibes' on their 1st date. She kept refusing to see him again.
Eventually she ran into him at a party, and figured out that at the time of their 1st date, his dog had just died and he was very sad, but he didnt want to bring it up and ruin the date. But she picked up on the 'darkness' and almost shut down their love story.
Moon in the 1st can be kind of erratic , even though they may be very perceptive and intuitive as well.