Introducing new kitten to old grumps

Hi all,
Well, I finally got through Chesters innital health problems and am ready to introduce him to the two remaining "geezers" of the family. The problem is it doesn't seem to be working. Here's what's happened so far:
I adopted Chester from a Humane society about 2 months ago. He's been locked in my bedroom for most of that time. During the day, when I'm home, I often will take the older cats out of our bottom floor, close the door and let him run about. Then at night they have full roaming capacity.
It took them about a month to even realize that Chester was there, and even at that it took him reaching under the door trying to play with them before they noticied.
They've comfortably spent time with his smells and his things, and seem happy as long as he doesnt arrive.
When I have opened the "gates", weather it be for long or short periods of time, he has affectionately run after them, mewing softly and often laying on his back with his belly in the air. THEY have run away, hidden under stuff, growled and hissed. None of them are interested in getting in a fight, not at all. I wouldn't be too worried about it if it weren't for the fact that things aren't getting better, and somehow worse (even with breaks).

Samantha (our big 17lbs 11 year old) runs, hides under chairs, moans and hisses if he gets anywhere near the room she's in...and occasionally spits.

Shadow (a smallish 13 year old) is skittery to start with, runs, hides under anything and everything and has stopped eating for the last couple of days. She finally started eating again last night after 2 days of seperation from the scary kitten.

What to do, What to do? All of our introductions have been easy up until this puss. Any ideas on how to make this transition easier?

Jess

Have you tried the vanilla trick?
"You put a dab of vanilla extract under the chins, at the base of their neck (by the spine) and at the base of the tail (again, on the spine not the underside of the tail!) of all of the cats to make them smell the same. Cats recognize each other by scent, so if that kitty smells the same as "me", the he must be a friend. Kitty logic at it's finest." - quote by valanhb

Originally Posted by yayi

Have you tried the vanilla trick?
"You put a dab of vanilla extract under the chins, at the base of their neck (by the spine) and at the base of the tail (again, on the spine not the underside of the tail!) of all of the cats to make them smell the same. Cats recognize each other by scent, so if that kitty smells the same as "me", the he must be a friend. Kitty logic at it's finest." - quote by valanhb

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I haven't heard that one, but I'll give it a try! Sounds like it might work.