Put handicap before the tournament

Wrong - the situation is worse. A rating of small and odds are no. I understand that it is necessary to come on time, but it is better to do the installation of handicap, regardless of the time of registration.

register early, tournament is only 25 minutes, registration is open for a few hours

Even I am not working, not sure that will be able to participate and are often recorded for 10 minutes before the tournament, life is not limited to the site

And I am glad to register in advance, but sometimes barely make it to the.

I also often register at the last minute or when there is a tournament. In advance don't do that, because I do not know will have the time/desire or not. Usually accidentally ingested. It would be probably fair to account for latecomers.
I Suggest counting the odds to do after completing all rounds, that would have been a surprise