I think it's a problem with my behavior during the date, because they text me back before the date. For example, last date I had with a solid 8 or 9ish, I focused on keeping her laughing and kino escalation. I didn't get very far because she said she had to go to her friend's birthday party. That same night, I sent her a message:
"Hey I hope you get home safe

"
She did not respond to this one. I waited three full days (the date was Saturday night), and I texted her on Tuesday, "Hey Jess, how was your friend's party the other night?" 8 hours later, there is still no response.
Another girl, a solid 9 or 10, was playing hard to get from the very beginning. I took her number because she couldn't hang out with me that same night, because she was with her girlfriends for one of their birthdays. Here are some highlights from the text convo:
"Hey it's Al, save this number, it might be the most important number you'll ever get

"
Her: "Haha wow okay

"
I tried to convince her to meet up with me and my friends at another bar, she said she couldn't because of her friend's birthday bla bla bla.
The next day, we were talking, and she mentioned that she's leaving for Texas in 3 weeks.
ME: "It's too bad you're leaving, but it is my intention to make you my temporary girlfriend until you leave

"
"But once you move you'll have to be relegated to text gf status, sorry"
Her: Bahaha okay that's fair
ME: "So temporary gf, let's have a frank discussion about our favorite sexual positions

haha"
No response.
2 days later: "Hey, all joking aside, I think you looked stunning the other night and I felt like we had some sort of instant connection. Tell me about yourself." (looking back now I think this one may have been weak.) No response as of 30 hours later.