Perhaps I am too used to writer's groups in which I can present a piece of work with the comment that I'm not sure about the effectiveness of the chapter, and I can expect constructive feedback.

This community is not a writer's group.

If you are looking for this kind of feedback and help with your writing, I'd suggest that you post your chapters on your journal, and post a link here asking for help with them. Then when you are happy with what you've written, you can publish it.

I hadn't actually realised that you were posting your chapters here looking for a public beta, rather than publishing them. If you want a story beta'd, or edited, or even proofread, it really is necessary to be clear and specific about what you're after - especially in a community which isn't specifically a writing group.