Do you get any error codes, and/or have you tried restoring a backup of your text via PIM, MyPhone, SPB, or other?
If these are plain-jane text message, then I really have no idea what's going on with your TP2, alex. I did a forum search and only found a handful of threads that are even remotely related.
http://forum.ppcgeeks.com/search.php?searchid=8355931
There is an arcsoft cab for Sprint (sans MMS) in the MightyRom thread--best way to find it is using the paperclip on the right hand side of the forum thread listing. But, as I'm not a Sprint customer I'm not sure which arcsoft for you to use; here's a link to the attachments in that thread:
http://forum.ppcgeeks.com/misc.php?d...hments&t=79579
Did text/sms work fine on the Stock ROM?
Edit:
The more I keep reading your initial issue-post the more I'm thinking those 3 test messages never got sent. Plus, the message tab in touchflo/Sense UI only shows recieved and not sent messages. Can you remember if you had full service when you sent those test messages or try to resend a new test with full signal?