All I have to say is:
STOP trying to make Superstar Laydowns, that's not what uNL is about. If you lose money in this hand, well bad luck then, but you'll win more often.
774 is a good board for KK, something like Q77 might be better, because villain could have a Q and give you major action, but they'll go to war with 88 here.
And something else: villains at NL2 would never raise you here with a 7, they love to slowplay...
PS: min-raise preflop should not be in your arsenal.
My advice:
Read the articles in the
sticky and from this
list .