Hi Oliver,
Your approach is the right approach. It does make you stand out because most men on dating sites generally send generic, sexual or very bland, unimaginative opening messages.
Reading her bio and sending her a message in relation to it is what you should be doing. You may be failing at it because you are too matter-of-fact about it.
Women on dating sites don’t want to feel as though they are being interrogated. When you send those messages, infuse them with personality and humor, even a little teasing.
This gets her attention.
It makes you come off as someone who would be fun to talk to as opposed to someone who is just entirely by the book with no sense of levity or nuance. This adjustment to your messages gets more responses from women on dating sites.