tank after WC as of right now
These readings are not correct if you're using API tests- the nitrogen compounds are read at either 0ppm, 0.25, 0.5, etc - not 0.05
0.5 is enough to be toxic to fish.
You replaced your substrate and filter within a very short period of time. Which means you removed/disturbed your entire N-bacteria colony. These readings are a reflection of a mini cycle going on in your tank.
I've no idea what's going on with your carbonate readings- they don't make sense to me either. I wouldn't imagine that the tannins coming off of the driftwood would be able to impact kH that dramatically, but that's the only thing from the info given that I can pick out that even MIGHT affect kH??
You can also pour boiling water over driftwood or run it through the dishwasher a few times with no chemicals. I personally would do that just to be on the safe side, to kill any pathogens and remove anything else that may possibly have been on it (pesticides, etc).
I personally wouldn't dose baking soda, I'd do at least daily 20% PWC (partial water changes) to try and get things stable. You need to do them anyways to get the nitrogen compounds at safe levels for the fish till the cycle is over.