Would you be willing to share the results of internal hive temps with us?
Hive - cluster temperatures are well documented in internet. What we can learn about it? Perhaps nothing. http://bees.freesuperhost.com/cgi-bin/yabb2/YaBB.pl?num=1134069490
I nursed bees 40 years without knowing hive temperatures.
But after taking into use electrict heating, I found the importance of warm. Now I may accelerate 3-fold spring build up with heating + pollen patty.
It means that insulation and ventilation + sunny spot whole day are awfully inportant to bees in spring.
And notice - night temperature is what rules the development of colony, not sun+day's highest temp + tar paper. Even human use to warm their homes at night - not during day.
Early spring build up makes to me extra yield month June from early start.
But still bigg hives and yiled are very diffrent matters. You may have 5-6 box hive and it is empty if flowers do not give nectar.
To get honey you must have big hives + splended pastures (move).
To get early yield you need much enough old foragers in spring =early start. All wintered bees will die before new yield start = early start to get enough new foragers and nurser bees.