Unfortunately, there isn't much you can do.
By design, it is very difficult to identify a person from a Bitcoin address. In principle, if the thief finally transfers the coins to an exchange to sell them, it might be possible to track the coins up to that point, and the exchange could know who received the money. But they probably wouldn't divulge this without a court order (even if it were), and they may be in a different country with different laws. In addition, the thief could use a mixing service or other techniques to make it much more difficult to track the coins until the exchange.
The IP address is a little better (yours is missing some points, by the way). You can use a tool like whois to find the ISP in which the address is registered, and your records will show which of your subscribers was using it at that time. But again, he would need a court order, and they could be in a different country. In addition, there is a very good chance that the thief is not really your subscriber, but someone who compromised your subscriber's computer and used it remotely. There could even be several layers of this.
Each of these steps would need the help of law enforcement, so it would be reasonable to report the theft to your local or national police agency and provide them with the information you have shared with us. (It might take a bit of work to educate them about Bitcoin, or find an officer who is already familiar with it). But unless the thief has done a bad job covering his tracks, he is unlikely to be caught, and even less likely. You can recover your coins.