Tips to Increase WAVE Recording Levels?

Amplify and Normalize are sister tools. They both work on sound peaks (not loudness) and the only difference is the handles or controls. As you noted, only Normalize has the DC Removal setting. Amplify has easier settings for difference adjustments.

There are variations. There is an RMS Normalize which is a custom tool for use in AudioBooks. That one does set loudness and with the other two mastering tools can create stable, matching spoken-word voice performances.