I appreciate the detailed and helpful reply, and I’m going to bookmark this for future reference! Thanks so much.
I hear what you’re saying about feedback suppressors being potentially too heavy-handed. I’m going to give X-FDBK a try and see how it does in my situation; according to the video tutorials, it’s possible to adjust the amount and the Q of each filter so hopefully I’ll be able to use just enough to fix the problem without affecting the tone of my voice noticeably. We’ll see!