If I'm speaking in my would-be feminine voice and put a hand on my upper chest, I can still feel it resonate just a little. Not constantly, but in about every word if I use a feminine inflection. Should I reevaluate my technique or is a bit of reverberation okay?

It resonates in my chest even in falsetto, below E4. I can bring my falsetto down to E3 before I'm forced to switch to chest voice. If it makes a difference, I have a slightly raspy/hoarse male voice due to lots of screaming and yelling when I was younger. I'm afraid I may have scarred something in the process, but I'm not going to let it set me back. I'm going to find my natural voice and if it's raspy as well, so be it. As long as it passes.

I just checked and I can feel some vibration in my chest and I know I am doing it right. I think in my case I am feeling vibrations from elsewhere. The important thing is to feel you larynx move up when you speak. If it's not moving, that is where you need to work on things. Try targeting about a A3 pitch for your speaking voice. C4 would be the upper limit for the voice average. It is possible you don't need the falsetto and it give you a stronger voice if you avoid it.

http://www.nyspeechandvoicelab.net/transgender/voice-feminization/

One big part of it is the breathing, breathing out pulling your belly  in as you speak is very impprtant.

Jessi

I think speaking with absolutely no chest vibration is not natural.