How much water are you boiling? I do the Late Addition Method.
1 .5 gal water
1 lb LME
Bring to a boil and add 3%AA Hallertau hops.
Boil 45 mins. Remove from heat.
Add remaining 5.5-5.6 lbs LME and dissolve.
Let sit for 15 mins. Pour into primary bucket. Top off to 5.25 gals.
Take readings. Pitch a good German Hefe Weizen yeast when temps are below 80F (70F even better).
I place 4 gals of PUR filtered tap water in the freezer for 4-5 hours priot to brewing. Temps usually go down to the 60s after topping off.