The first thing the system expects from you in such a situation is downshifting. That will increase your cadence. However, the whole AUTO system is weird. When the inclination sensor detects you're about to climb, it should immediately increase the current fed to the motor, or give it more watts. Giant AUTO doesn't do it.
Secondly, who on the earth invented "changing power levels"? The AUTO system should dose electricity
steplessly according to the information from as many as 6 sensors of Giant e-bikes. Smart Control in
Specialized Turbo e-bikes works so and it gives a seamless riding experience.
The fact Giant AUTO "changes power levels" is the main reason behind the jerky riding experience. I'm far better off with manual changing of the assist levels combined with proper use of the derailleur. Actually, I change assist levels in my e-bikes very rarely.