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Couple of things. Your on camera flash might have a pre-flash meaning it might be triggering the slaves on the strobes a split second before your shutter is being released, so your strobes are firing then recycling when your shutter and your on camera flash actually goes off.
I recommend putting your camera in Manual mode and either tether your camera to one of the strobes (use a pc sync cord between your camera to your strobe) or buy a remote trigger you can place on top of your camera's hotshoe (I am assuming you are shooting with a digital SLR and not a point and shoot).
Otherwise the typical SLR should sync at 1/200 of a second or slower as a general rule of thumb so it doesn't sound like that is the issue here since you even attempted so slowly...sounds like what I am suggesting in my first paragraph.
Hope this helps.
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Paul M. Games
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