In general i kike the web pages.
but with a large / wide display it would be useful to have a couple of options and or some "responsive css" ala bootstrap

1) column width , option for wider columns when the display is wide enough this could let some elements be taller and wider like the temp and ph graph.
2) add 1 ,2 or 3 more columns if the display is wide enough.
3) div boxes to group elements and the boxes can be moved between columns so they are a group of items.

if done right this could make the display nice on a wide screen and also collapse to a small screen. for example my current dash board if it has one more column i would not need to scroll down to see a few items.

the 3 column default is good, just a few tweaks to add options for the folks that need them.
esp as more new devices come out and we need to add more panels to show them