I while ago I did a hypothesis test at various critical skills levels to determine the formula, but also found no difference! I presume you did the same test I did, using training dummies and casting skills on yourself. This was Muldar's explanation:
There are several factors influencing the critical probability:
- a baseline critical percent (~8%)
-
a critical factor based on the mob (by level I believe?)
- your critical ability
The formula then roughly follows this (it is likely the second terms are to the power of a decimal, but we don't know for sure):
probability of a crit = .08 + crit factor * critical ability
This explains the following results:
- training dummies have no crit factor, hence the static 8%
- players have no crit factor, making leveling crit skills useless for Support Druids (static 8%)
We should though see differences by varying the critical ability and mob level/stars. I would like to see the following tested:
To see whether mob stars makes a difference:
- hit Mordris 500-1000 times, record the number of crits
- hit a 190 4* mob 500-1000 times, record the number of crits
- hit a 190 1* mob 400-1000 times, record the number of crits
To get data on how crit % changes with mob level and crit ability:
- hit a level 100 mob 500-1000 times with no crit gear, record the number of crits
- hit a level 100 mob 500-1000 times with some crit gear, record the number of crits
- hit a level 100 mob 500-1000 times with lots of crit gear, record the number of crits
- hit a level 150 mob 500-1000 times with no crit gear, record the number of crits
- hit a level 150 mob 500-1000 times with some crit gear, record the number of crits
- hit a level 150 mob 500-1000 times with lots of crit gear, record the number of crits
- hit a level 200 mob 500-1000 times with no crit gear, record the number of crits
- hit a level 200 mob 500-1000 times with some crit gear, record the number of crits
- hit a level 200 mob 500-1000 times with lots of crit gear, record the number of crits
That should be enough to figure out the complete formula, of course the more data points the better.