Low profile tires drive like crap. Most follow every rut and groove in the road. Get used to it, or change tires/wheels.
Does your car have the SmartKey? Early (98-00 or so) ones don't have great range, and the trunk (boot) release must be held down to avoid accidental opening. The longer signal pulse required means a greater chance for interference from other RF signals, and usually shorter range than the other functions on the key.
1998 C230 "Black Betty"