Don't worry about rH (relative humidity) when unless you're flowering. When flowering it should be around 40-60% rH but during veg it can be anywhere from 20-80% rH (or higher) and it won't really matter, in fact, when the plant is young and/or in veg a rH of 60-80% is generally helpful because it reduces transpiration so the plant doesn't dry out too quickly or anything.
Just so you know, any burn tips or markings from from nutrient deficiencies, such as yellow leaves from a Nitrogen deficiency, won't go away once the problem is solved, once like that, they'll always be like that, but the new growth won't be like that, unless the problem returns or something. Nothing to worry about of course, but don't go looking for your leaves to magically turn back to the way they once were mate. It's the new growth you want to keep an eye on, and watch the problem isn't spreading over more of the plant.
Cheers mate.