Dynamic converters?

I had a custom converter made for me about 1.5 years ago and stuck it in when i did my motor swap. I heard they were supposed to act normal under regular conditions but mine seems to be slipping. anyone else have problems or is this normal? i have a video of it. the transmission was dumped of all the fluid so could it jsut take a while to work?

http://www.youtube.com/watch?v=w2OyZzh_22o&feature=player_embedded