From 1 to 50 leveling them how you wished was fine.

From 51 to 60, I'd strongly suggest you level them all together, in parallel. HOWEVER - either keep them all at the same level, or no more than 2 apart. Unlike ARR, the penalty for attempting a recipe above your level is rather large in HW. You will find it much harder to make higher level refined materials for one class if the class that makes the material is much lower.