The one thing that has stood out with all of the form chats I have read and posted in past cpl years.These are mainly bracket deals. The converter is 90% factor for consistent and/or fast dragsters.Loose seems to be best for consiastency with slight compromise of max performance. Getting max performance can be tricky and takes few trial and errors.Seems you loose some consistency.
Like everything else in racing its all about combo.Change tires,gears,cam,heads or anyother item that may change power output and power band and you are back to changing converter a little also.