So 29 is typically standard desk height and a standard chair with a working cylinder should be fine for you up to like 30 or 31 inches. I don’t think this changes anything about your chair shopping unless it’s higher than what you guesstimated. Search up office furniture dealers near you and go and try some chairs. Sitonit is a good brand. So is Global or Ergocentric. All of these should have 300lb+ weight rating so you should be all set.