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This is how I did it...it requires much patience, an improved invisibility spell, and a character who can set traps, so it might not help you much, but here it goes anyhoo:
Have the thief set as many snares as possible all along the corridor, even if it means resting for no reason other than to allow him to set more.
After the snares are set, make a character, preferably one with a ranged weapon improved invisible. Get all your non-invisible party members out of sight of the doors, then have the invisible one waltz over and open the door...the mind flayers and umber hulks will start trying to chase him or her down the trapped corridors. If not all of them chased the char, then have the still-invisible guy go back and close the door to the room they're in, then set traps again.
It took me a long time, but I killed all the mind flayers without losing a single party member.
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