Archiving - what am I doing wrong?

Honestly not sure what Im doing wrong with archiving, here is my cron:

10 /1 * * * /usr/bin/php /var/www/html/console core:archive --url=https://matomo../ --concurrent-archivers=4 --concurrent-requests-per-website=5 >> /var/log/matomo-archive.log

sometimes it runs fine and archives in under 5mins, sometimes it seems to go back to way older dates and then runs for hours and hours - essentially breaking any new archiving so I have to go in and kill all archiving processes and run it again manually and then leave the cron from there. Any clue what else I could be doing to have the archiving run better?