Hi, Gavin.
The short answer is yes : ).
The longer your band writes song, the better they get. To verify this fact you can check song's level on it's page. It is better to compare songs from the same band, what level songs they write in 1 day and in 3 days.
To answer why 1 day song performed better than 3 days song, we need to check many factors. Were these songs from the same band, maybe these songs were written with different band members. Maybe there were not many of new singles in the charts, that way your song had better opportunities to chart higher. Just a short reminder, that single's position in the charts is determined by three things: song`s level, it`s fame and duration in chart (days).
I hope your questions were answered. If not, just let me know.