Could we updated NAV port metrics every 1 min?

Hi all, I am a network administrator and new to NAV. I really like NAV and am going to use it. But I found the Port Metrics Traffic graphs is updating every 5 mins.(I knew it's default intervals for NAV)

I want to get more accurate Port traffic graphs, so could we change it from 300s to 60s? I did research and changed storage-schemas.conf(added 60s:1d) and used whisper-info to ensure those ports traffic wsp files have been changed to 60s.

But I still can't get correct data via rickshaw JS and NAV still collected data in every 300s. So is that possible to change it? Or someone can point me to the right direction? Thanks.

Bruce