Changing TKLBAM full backup frequency

I'm using TKLBAM successfully on my physical LAMP stack but am having bandwidth issues when it does a full backup.

Does anyone know if there is a way to allow the daily incremental backups to continue but the full monthly backup only run on a Friday?

i.e. even if there are more than 31 incremental backups, dont perform a full backup until the next Friday occurs.

I have had a look at the Python scripts but can't fathom out whats happening!

Many thanks