I dont know about the amber bugs. Will definatly need to see the pics (how are you trying to add the pics, with a link?). <--- We should sort this 1st
Starting from putting the clones in...
1, What temperature is the water? I keep it between 18 and 21C max. Low temp tap water will shock the hell out of them and you'll be lucky if they just wilt as they wont take nutes or water.
2, When the ppm goes up a lil, I wouldnt worry. Its probably just the water and nutes stabalizing. (When did you check the nutes after the res change?)
3, Clones can just die sometimes but I would say most deaths are from human error. I normally have around a 98% success rate.
Hope this helps bud.