Wirelessly posted (HTC Diamond: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 7.11) Sprint MP6950SP)
I think you just need to flash the original shipped 6.1 rom that came on your device. Maybe do it twice. Then I also recommend using sktools to remove what you want. You should be able to uninstall apps like the sprint stuff with sktools by going to the installed applications section and click on the right softkey and select settings and then scroll down and enable the option to show apps not listed as "installed." Then when you do a search they will come up.
If you have given up on your device then only a different device will make you happy. I doubt anyone can come up with a majic solution for you. You are gonna have to decide what you want and learn yourself. If you do then you will be much happier with your device. Good Luck!