Have you tried using Pandora Image Viewer for manga? I love it so much. I use HakuNeko as my downloader, boot PIV and select the downloaded directory of the chapter I want to read, and then hit 'w' twice to make fit width my default zoom setting. I scroll with the left nub and change pages with either the d-pad or the shoulder buttons. When a double page comes up with small text, I hit '1' for 1:1 zoom and scroll around with the left nub.
I tried using the dedicated comic readers briefly, but PIV works just way too well for me to switch!