Hi again, First of all I've never done autos.( i do have a g-13 auto fem NL seed)
Having said that, I would think you would be farther along at 7weeks.
Let someone else chime in.
81 is a bit high.. I try to get close to 78. Don't know your setup, but if u can add some more ventilation that will help keeping the temp down.. Water temp of 68 is perfect.
Good luck!