On that list, you mention an NAC nasal spray, but also said to avoid anything too acidic or tart. I've always found NAC to have a strong sour (or tart) taste. Are you using a buffered version?
Yes, NAC is quite tart in taste, and I am sure if you snorted pure NAC powder it would sting like hell in the nose. However, I am just using 50 mg of NAC in 10 ml water, which is very diluted, and then spraying it into the nose using a nasal spray bottle atomizer (which usually delivers a 0.1 ml dose in each spray).
By the way, if you want to make up your own nasal spray solutions, it's a good idea to add a touch of salt to the water, to make the water into physiological solution (physiological solution has the same NaCl salt content as the blood). Physiological solution contains 9 grams of NaCl salt per liter (or 90 mg of NaCl salt per 10 ml of water).
I find physiological solution is more comfortable and less irritating in the nose that plain tap water.