To focus do you need to go further in or further out? If out then just pull the eyepiece out a bit and tighten. You can get parfocal rings than lock around the barrel to give you the correct distance each time. See
http://www.scopestuff.com/ss_par1.htm
I've not seen an XW up close only a picture so are you saying a 2" barrel is screwed into the wider portion of the eyepiece? If so then this should got into the focuser all the way and you would in fact get the eyepiece in further in 2" mode. If you were using your eyepiece in 1.25" mode would you actually have the eyepiece out a little further (typically 5-10mm depending on 2"-1.25" adaptor although I know some adaptors are quite thin).
Note if you are going to get a new threaded 2"-1.25" adaptor you need to make sure you will have plenty of clearance inside so that the 1.25" barrel of the eyepiece does not hit your 2" filter.