OP I am not sure if you are aware of this... But Sprint's TP2 does NOT have a subsidy (network) lock EXCEPT it's patched that it will not let you to go on any US-based GSM networks.
In order to let Sprint's TP2 GSM gets on an US-based GSM network, you need to do the SECURITY UNLOCK first, then flash a patched radio. HSPL is for flashing a different ROM, not radios, especially GSM part of the radio.
Check this out:
http://forum.ppcgeeks.com/showthread.php?t=93865
As for your HTC unlocker... I think you spend the money at the wrong place. See if you can get a refund on it and use it on the proper unlock procedure linked above.