I know how you feel. I've looked for years.
It's not that there's a right answer available to all that no one is listening to. It's that researchers and educators have not yet uncovered the magic bullet, the perfect environment, the "right" method for teaching any deaf kids, not just whose primary language is ASL, to read and write in English, to achieve in school.
As a proponent of a bi-bi environment, and given that we've made an active choice, reinforcing that choice every year of the past 4 my daughter has been affiliated with an ASL-based school for the deaf, fighting alternatives to maintain services and placement at the school, I've searched far and wide for documentation and research to guide us and to support the approach we have found to be right for our daughter. Everything I find supports
Marschark's quote: "The evidence has convinced me, more than ever, that there is never going to be a "one size fits all" solution for deaf children either educationally or in language."
I recommend
this book: Evidence-Based Practice in Educating Deaf and Hard-of-Hearing Students (Professional Perspectives on Deafness) -- which is packed full of research and new statistics. Check out GoogleBooks for a free online version of the book (there's a limit on your viewing). The Journal of Deaf Studies and Education you started looking into is a great resource, they have devoted entire issues to literacy, and over the years they've published numerous studies of methods attempting to improve the literacy of deaf and HOH kids at all different ages, in many types of academic situations. Check out their last 2 issues -- amazing articles on literacy. Takeaways from both these sources are often woven into the responses on the
educatingdeafchildren site. And if you want any specific article from the last couple of issues, PM me, I may be able to help.
Most of what's been done in the past hasn't worked for deaf kids when it comes to education. Not the various types of oral education programs, not the ASL-based education programs, not bi-bi education, not the mainstream and inclusion and unit settings. We see terrible academic outcomes. And too many gaps in the data captured. Most of the deaf kids in mainstream settings don't even register on studies of how our kids are doing: unless they are taking a separate or accommodated (visually interpreted) version of the exams, they are being classified as typical 'hearing' students. So you can't really get the kind of data on how CI (and HA) kids are doing in the mainstream that we could compare to CI kids in an ASL-based school, or how deaf kids raised with English compare to deaf kids raised with ASL as their primary language across the various settings.