Filters drove me crazy after a while. I just bought a factory refurbished XT on ebay for like $200 and sent it to LifePixel for conversion. It's the best option if you are serious about IR. Composing normally, using normal exposure values, shooting moving objects, etc... is such a creative force with IR. The filter really hampered things. Filters work great...but a converted camera is IR freedom!
Which lens do you use on the converted XT now? What was the overall price that Lifepixel charged you?

