Hi,
If I correctly understand your purpose and necessity of using a fixed daily tick interval, I see only two alternative possible solutions here:
1. Using the Highcharts' navigator with the scroll option, as I've described in this topic:
viewtopic.php?f=19&t=49971&p=182267#p182344
2. Setting a fixed chart width and programming your own scrolling mechanism outside the Highcharts functionality.
I hope you will find it useful
Regards!