Motorcycle Repair: Tranny Fluid Blow out, vent hose, slide kit

Question
I have been having problems with my tranny fluid blowin out the vent hose. Had the hose re-routed to a Service Bulletin for 2000 Sportsters. Did not work. I have a XLH 1200, 2001 Sporty. The only re-mod was some carb work with a Thunder Slide Kit and an air filter up grade. Any and all suggestion will be appreciated.

Answer
I thought I had answered theis question, but maybe I didn't.  There can be only two ways this can happen. One is the vent is to low and coming out that way. The other is filling the trans to full. When you changed the oil how much fluid did you put in?
Mike