I can completely grind through a level as my weaver. With some items giving good exp for a handful of levels on top of stocking my retainer... there really is no need to resort to leves outside the nice little bonus in exp gain.

However, botany is... um... painfully slow. In 30+, I really do rely on leves to make the leveling bearable. Part of the problem is that the activity is pretty monotonous - you're just running from node to node, typically running circles. If there was a bit of variety to the activity, that would help.

Other random thoughts:
* Increasing GP regen rates - more GP means more HQing or the ability to consistently gather higher level resources
* Giving us an exp boosting ability
* Alternative to the above, for the ability that increases yield, have it double exp as well
* Company neutral supply missions - this gives us an additional activity and source of exp
* Simply increase exp rates...