Safety glasses should be worn when using a grubber or pick on rock. Straight tracks are fast, but forgettable.
Berms are pretty popular too.
This may seem large when you are working on foot, but as soon as you jump on your bike it makes sense. Avoid cutting down native vegetation. The big plan is to restore Makara Peak to a native forest, so where ever possible we direct tracks around native trees. For a track to last through winter, rain water must be able to drain off it, rather than down it. It doesn't take long for water to scour out a rut if it gets the chance to build up volume and momentum.