I had exactly the same soft-brick yesterday, but was able to get out of it.
What you will need to do is the following:
Pre-req for this to work is you have to have ADB installed. If you do not already have this installed on your PC, use your phone and you should be fine. The other thing you need to get is the Universal Naked Driver for TFP which is available here on XDA.
1. Boot the TFP into CWM (you should already be there)
2. Open a Command Prompt window, and go to where you have ADB set up
3. Connect your tablet to the PC via the cable.
4. Check to see if your ADB setup is seeing your Tablet, you can do this by typing "ADB Devices" after the prompt. If it sees your tablet it should show your Device Serial number as connected.
5. If your tablet is not showing up, go to Device Manager (you can get there via Control Panel) and check to see if it shows up there as a device. Add the necessary driver (the UND one) here so it sees your tablet.
6. If you have installed ADB correctly, and it sees your device, then go to this thread:
http://xdaforums.com/showthread.php?t=1514088 and follow the directions for a Option 1a recovery
Honestly, it took me about 4 tries to get everything setup properly, and took about an hour because I tend to go slow and careful, but I am up and running and fully recovered now.
Good luck