There are a couple of possibilities as to why the ammonia does not seem to be bothering them.
1) You mentioned you have been using ammo lock. That will "bind up" the toxic ammonia so it does not hurt the fish. I suspect this is
what you are actually experiencing.
2) If your
pH is below 7, ammonia takes a less toxic form...meaning it takes a lot more of it to get dangerous. The flip side is that if
your pH is higher than 7, the ammonia actually becomes even more toxic, and it takes less of it to harm the fish.
Keep up the water changes. As with the original cycle, this could take a few weeks to work completely through, so keep a close eye on the fish and test regularly.