A reply for Martin Cohen: I have been in a similar situation, I submit the better version of the presentation that doesn't have all of the information in it. On one of the final slides, usually the one with my contact information, I include a link to the original paper (or a handout or some sort of explainer) so they will have access to the information as well. The abstract you submit with the presentation should have enough information for them to be able to make a decision. Otherwise, I would try to get into better organized conferences. tl;dr: submit the best presentation and if they don't accept it, move along to a better conference.