Unfortunately I'd say no, not if you still have that much ammonia showing up. The rule of thumb I've seen is you should be able to add 2ppm ammonia and have it completely converted to nitrates within 24 hours.
It's odd that you're seeing ammonia and nitrates at this stage: you tend to see the ammonia-consuming bacteria show up very quickly (see the graph here), then the ammonia disappears but nitrites skyrocket and linger forever. They might not actually be coming from your denitrifying bacteria: do you know for a fact that your tapwater has 0ppm nitrates? If you haven't done so already, mix up a batch of new water as if you're doing a water change, let it sit about half an hour, and then check to see what your starting conditions really are.
I'm also skeptical because you've been dosing the ammonia weekly. Were you testing to see when the ammonia started dropping to add more? If not, your NH3-consumers may not have had enough food to get established. (Two thumbs up for dosing your NH3 by the way: it's a lot more work than using fish, but so much safer for them, and more reliable.)
I'm not convinced many of the bottled nitrogen cycle starters are very reliable, by the way. Older recipes don't actually have Nitrospira, the bacteria that consumes NO2, because until a few years ago, other dentrifiers were thought to be much more important to the aquarium nitrogen cycle than they really are.
