Ever since I had land that I laboriously levelled glitch, reverting not only to its craggy original condition, but also to extreme mountainous type terrain I have been very frugal when it comes to levelling land. The first time this happened was in a Draugr village I had restored and repurposed as a foreign HQ, where I have been told it is a common glitch. Now I will insert vertical and 45 degree posts into the ground as foundations and build my flooring on top of them. Half submerged stone blocks also make great foundations upon which to build level structures on uneven ground. Now when I chose to repurpose a Draugr village, I will destroy 1 or more of the buildings, using the pre-levelled base on which to build or use for garden plots.

To get perfectly level ground using the hoe, I chose the height I want my land to be, set my camera for a straight down overhead view, then slowly move forward constantly clicking to level. This is the most effective method I have found after playing the game for over 3000 hours. Be careful to step back every now and then and survey your work as there are some areas that will not level, requiring one to add height or remove land using the pickaxe.

Land I levelled in a Draugr reclamation project: https://steamcommunity.com/sharedfiles/filedetails/?id=2900820733

The same land a few hours later after having glitched: https://steamcommunity.com/sharedfiles/filedetails/?id=2795535497