How much is sending your initial message due to the fact they're turned on by tickling? If you disliked everything else about a girl but she was turned on by tickling, would you still message her? Or, would you be interested in "getting to know them as a whole" if the tickling tidbit wasn't mentioned? Balancing a fetish out can be difficult for some.
As for lack of response, it's all about the pictures. If you don't have any, good luck! While there are some people that say "it's not about the looks", surveys show especially in online dating that it's primarily about attraction (even if initial or slight), especially since you aren't meeting this person in real life. Maybe your "match %" is >90% and you have tons in common by the profile, but if there's no attraction, there's little hope.