I for one don't believe in a highland and lowland species separation. I do believe in a "greenhouse" and ultra highland separation group.
In the case of N. maxima. I am also in the same boat as trent and Volker. I live in sunny tropical Hawaii with good success with all of my maxima clones (Tlatawiran, Superba, Dark, Pieriensis, Borone, small form, LHSC, ABG, EP's various alpha clones, etc.) many are large growers with handsome pitchers, and attractive leaves.
I find wavy margins occur on plants that are in bright light conditions. Plant N. maximas in a loose airy potting mix as they grow better in a mix that drains fast and dries quickly.
Michael