In YEM Battle Engine 1, lines 1878 - 1887, you will see the following hash:
CODE
# For those who would like different success rates for each status effect
# based on ranks, you may change their settings here.
STATE_RATE ={ # Do not remove status ID 0.
# ID => [RankS, RankA, RankB, RankC, RankD, RankE, RankF],
0 => [ 200, 100, 75, 50, 25, 10, 0], # Common
116 => [ 300, 150, 125, 100, 50, 20, 0], # Status effect 1
117 => [ 300, 150, 125, 100, 50, 20, 0], # Status effect 2
118 => [ 300, 150, 125, 100, 50, 20, 0], # Status Effect 3
119 => [ 300, 150, 125, 100, 50, 20, 0], # Status effect 4
} # Do not remove this.
Make sure that the two states to which you're referring aren't set differently from the common state - or, if you like, set them all to a different rate.
That should solve your problem!