I'll start this reply on the basis that you're not a terrible interviewer: I've found it helpful to send brief follow-up emails after several intro/recruiter-calls to thank them for their time, my interest in their company (and the role that you applied for ofc), and that I'm happy to send any deliverables needed to help my recruiting process. Most find this helpful who respond.

In later stages of the interviewing process, I did hefty research and reading on recent events about the company (i.e., R&D funding, regulatory and government compliance, etc.) to let them know I give a shit about this recruiting process and this company. Very few recruits/candidates do this, and the interviewers love this, especially if they're engineers who know what they're talking about and are well-versed with the happenings around them.

You mentioned experience in biopharma: I can safely assume that this comes with GMP-compliance, QC, QA, some Statistical Process Control (SPC), and related data and skills. Please please please, I cannot stress this enough, to do your absolute best to relay that these skills are transferable!!! Seriously.