Stop using canned openers for online dating. Stop copy/pasting the same thing to numerous women. They get "form" openers all the time that are obviously sent to dozens of people at once, and they can tell that you DIDN'T read their profile - and they won't give you a second thought because of it.

Instead, read their profile. Lift words and phrases straight from their profile and use them in your opener. Show them that you read it and there is a genuine connection between the two of you or you share the same interests (don't make her think you are messaging every decent looking girl on the website).
Don't say anything creepy or sexual. You will doom yourself by inserting a line like "you seem like the kind of girl that would be great to wake up next to in the morning." The vast majority of girls will consider you creepy if you put any sexual shit in your OPENING message... there's nothing wrong with being sexual and trying to get into her pants, but fkn save it until she has at least shown interest in you.

If you're going to use some kind of canned DHV or Neg or Game in your opener to get them to respond, you at least need to preface it with a few sentences demonstrating that you read her profile and aren't just messaging everyone on earth.

*the above advice comes from a lot of success I've had with online dating, and talking to very hot girls I've met through online dating and having them show me the messages they get every day and what they hate/like about them.