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Not sure if this will help as my setup is a ccd not a dslr. I have the FR mounted in the holder and about 3/4 of the way forward (ie towards the OTA). I have a CFW10 on the front of my ST2000 so the end of the draw tube to the ccd surface is about 33mm and the FR to ccd is about 95mm (just a bit under the recommended spacing). I get focus with about 15mm of out travel on the draw tube.
AFAIK the sensor on a DSLR is about 55mm behind the front of a Tring so the spacing should be about right with the FR is the middle of the range. you do not have the FR mounted in the holder backwards do you?
I have a Canon 20d as well so I will try it out, pretty sure it should work ok...
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