Can this judder cause damage to the car cause it feels pretty violent in slow moving traffic and doing hill starts! 
I've used Helix organic clutches for years in various VWs and believe me, they are among the smoothest out there in the aftermarket..... so yours juddering violently is not normal. They can judder a *little* at a particular pedal position and rpm, but over time this will disappear completely at best, or stay the same at worst.
I would say bleed the slave cylinder again and learn to get the pedal / rpm balance right to work around the juddering. Try pulling away with more revs than usual, but don't race the engine. You should notice it's a lot smoother and will also help to bed it in. If you feel it really isn't right (and it should be user friendly tbh), I would seek advice from the installer.
