Recommendations:

• balancing the number of spells in each level across schools
• balancing within each school the progression of the number of spells in each level
• increasing the number of low-level spells
• balancing the aggregate usage of each school
• balancing within each school the progression of usage from level to level

Drawbacks of the data interpretation used to make these recommendations:

• 'number of casts' doesn't necessarily reflect the usefulness of a spell. As such, this is only a valid heuristic for large differences, which unfortunately we have here.
• The data crunched has been gathering for some time, so the new Renaissance spells haven't yet had a chance to make much of an impact. Further balancing in terms of spell/skill power (but not which ones we add) may become necessary as new data is collected.

Qor:

• +2 level 1
• +1 level 2
• [perhaps move a level 4 to level 3 - since shadow rift and curse weapon are very low-impact, not a big deal]
• [perhaps +1 level 3 - substitute for above]
• make level 1 more useful
• make level 4 more useful
• make level 5 more useful

Shal'ille:

• +2 level 1
• +1 level 3 [or move a level 4 to level 3]
• move a level 2 to level 1
• make level 2 much more useful [may be difficult to increase usefulness while decreasing # of spells]
• make level 3 much more useful

Faren:

• +8 overall
• +3 level 1
• +1 level 2
• +1 level 3
• +1 level 4
• make level 3 more useful
• make level 4 more useful

Kraanan:

• +3 level 1
• [perhaps +1 level 2]
• move a level 3 to level 2

Riija:

• +1 level 4
• make level 3 more useful

Jala:

• +1 level 1
• +1 level 2
• +1 level 3
• +1 level 6

Weaponcraft:

• [perhaps +12 overall - probably too ambitious for this update]
• +4 level 1
• +2 level 2
• +1 level 3
• +1 level 4
• +2 level 5
• +1 level 6