Have a new custom grow box with temperature question

I just finished putting together a growbox . I am happy with my choices of lights ect. It seems to be working as planned. I have a hydrofarm daystar ac 6" with a hydrofarm 6" inline fan . My box is 4x4x8 . I also have added a 10" dayton variable speed fan directly to outside. I am pulling my air with the inline through the reflector and to outside. The air is drawing from vent holes at the bottom of box to the reflector which is also passing through the plants. I have measured my temps at several diferrent places in the box . It is at 75 on the floor during the night and 77 during the day. On the base of my clones on the container at soil level it is 82-84 during the day and 77-80 at night . I am using a hortilux blue m/h with a lumitek 600w digital ballast turned down to 400w. I read on here that temps should be at 77. But where in the growbox are they talking about it is differrent temps in dif places? This is my first indoor grow and I am showing the pics for the first time . While your looking I would love to hear what you guys think of my setup. I spent a good amount of time reading and asking a few questions to make this box. I just need to be sure my new clones will endure the temps.

THANKS IN ADVANCE