to an earlier question: if the color matches at 4 it means 4. the color should graduate up to 8, not really take a big jump all at once.
I dont see the point in adding a shrimp, you have ammonisa in there.
i am not familiar with aquasafe, does it say it has something in there to"make ammonia safe" or words to that effect?
in that case I would suspect it of messing with the cycle and or the readings. worth a good reading of the bottle
In fact I would suggest ,empty the tank and begin again Without dechlorinator. ( it won't set you back)
Also, try raising your temp, The bacteria multiply faster at highr temps
Here are links to two articles by THE Freshwater cycle man, Dr Chris Cow.
Take note especially of the instructions regarding adding ammonia.
http://www.mikeandmarys.com/cycling.html (Originlly published in 1999)
http://malawicichlids.com/mw01017.htm Update, not sure of date