Mine is a custom diy build, but uses 240vac heating elements for heat and 120vac for everything else.
All controlled by a mini PC and a custom labview program i wrote
Nothing wrong with lastose, but there isn't allot of sweetness as much as mouthfeel.
Just my opinion, but i disagree with the others the high crystal and a candy sugar in the 180L will give you carmel notes, even a burnt sugar or deep toffee will taste like caramel when out up against the deep...
What temp are you doing the d-rest at?
With 4 packs of yeast , you should be fine, that is a decent pitch. Just remember a cold lager fermentation is slow and takes a while..
There is some truth to what your are saying. BUT.... If you are looking to utilize certain enzymes more than others for specific amounts of time. Then temp is important.
Personally have seen different batches of the same recipe f8nish fermenting at different FG with only difference being...