I do feed snow from time to time, but only very sparingly. I am very careful to minimise the amount of food that I add to my tank for the simple reason that it only takes a tiny amount of anything leaching into the water to change TDS when the water is so pure like when keeping zebs.
Think about it like this - assume the TDS in a zeb tank is 20. A change in TDS of just 5 ppm changes the TDS to 25, but this is a 20% increase! The same change in a cherry tank (say 200ppm) to 205ppm is just a 2.5% change.
As for starting a new thread - its up to you. I started a new thread because I started a new tank. I think its more important to document what you do/dont do so other people can learn from your mistakes or hopefully success!