That's a tuff call. It's too bad Alltel isn't bringing in any Touch Pro class phones to replace the TP.
Is it just TF3D that you are not liking about your Pro?
How about giving SPB Mobile Shell at try. They have a trial period.
http://www.spbsoftwarehouse.com/products/mobileshell/
To disable TF3D, in the settings today, uncheck it from the list and it will stop loading.
Do you make sure to actually close the applications after you are done using them? Things like the Opera browser running in the back ground can make a phone sluggish.