We are sorry you are having challenges with your Exmark. Power consumption is greater on the LZS because the LZS travels 10-20% faster than previous LHP (LZE) models. Reducing operating speed (still as fast as the LHP/LZE) should resolve the concern in challenging conditions (hills, heavy grass) while still having extra speed available for lighter cutting conditions.
The bagger could also be a factor, as the older style baggers (LZUV2B/3B) are larger and heavier than the new baggers (116-3000/116-3001). If you’d like discuss further, please send your contact information to firstname.lastname@example.org
and an engineer will get in touch with you.