Male Enhancment is unnecessary, as BDLM covers that extensively. However, you can add SPE if you need it.
Yes, its worth doing so. The Aura and Alpha modules would cover other aspect of Alpha qualities that you might need, want, or would like to develop, like wise with Auras. They’re different.
Take care that adding more auras could potentially drain you; however, with proper listening and responsible approach, you will be fine eventually.
Take the modules that are useful to you and do not worry about redundancy, that’s not a thing here; however, rather than redundancy, be concerned with density and intensity. Do not kitchen sink.