Nice setup. I actually just ordered the same filter from thefilterguys. I also have to deal with chloramines, and I plan on using almost the exact setup you have, minus the icemaker carbon filter. Why did you add this to your filter? I did a fair amount of research on filtering chloramines prior to my purchase, and I think the ammonia I add to the tank will be so small that it will be a non-issue.
There are a couple discus breeders I found that filter chloramine the same way you did and I am planning, and a couple of them say the ammonia level is unmeasurable on their test kits once the water passes through the chloramine filter. Once I get my drip system setup, I am going to measure the ammonia level straight from the drip system and will adjust if necessary. I don't think the ammonia is going to be an issue from what I have read and what other people that use similar setups have said.
I also don't think dripping the water w/ ammonia is going to result in any higher nitrate readings than if I were to drip prime as well. Prime will bind the ammonia into a harmless compound until this compound can be consumed by the biofilter. This is a bit of an assumption, but won't the prime-bound ammonia compound, once consumed by the bio-filter, result in the same amount of nitrate production as a similar quantity of ammonia dripped into the tank? I don't see how it would be different. If that is the case, I don't think dripping prime offers any advantages over filtering the chloramines through a filter and dripping the water with a small amount of ammonia straight into the tank.
