The hotfix says:
so what does it have to do with felwood or barrens.
strongest merc: 4
bounty level: 4 or higher
high chance of MS
the only 2 numbers you have to look for maxing out the ms apperience are the levels of your mercs relative to the bounties:
merc > bounty: low to 0 chance
bounty > merc: increasing chance the higher the difference is
thats the only information we get. so where did you get your informations?