Salinity is a little low should try to get it between 1.023 - 1.026, just add small amounts of salt until you hit the target range (I keep mine around 1.024)
Temp is okay in the 76- 82 range a slite fluctuation of 1 or 2 degrees is not a big deel since it will be happening over an extended period of time throught the day. I personally like to use 2 heaters of lower wattage over 1 higher wattage ,as it is easier to avoid temp fluctuations, cold/hot spots and if 1 goes on the fritz there is a less chance of boiling/chilling the tank.