What a wealth of knowledge God has gathered here by bringing ladies together on this board!

I found myself nodding my head as I read these many posts.

From having taught in the ps setting for 7 years prior to homeschooling, I would second that the best thing for your ds would be to homeschool. Due to the sheer volume of dc in ps classrooms, dc with language difficulties (or any difficulties for that matter) often fall through the cracks. One year when I taught third grade, 11 of our 30 students were diagnosed with learning difficulties and began receiving extra help. Sadly, teachers sometimes do not want to go through the process of testing dc for services, as it requires a substantial amount of work and time. When Carrie and I job shared, over 1/3 of our 3rd graders could not read or write at (or near) grade level - hence the testing. All of them qualified -

- which brings me to my second point: Even if dc are properly diagnosed, speech/language teachers are often overly burdened with too many students and not enough time to provide the services they long to provide.

You will be working with your child 1:1, which is an excellent ratio that cannot be beat.

Homeschooled dc are actually often much MORE social than dc in ps, as they grow up in an environment that better parallels the real world. Learning in an environment with a variety of ages, with both children and adults present is much more like how normal life goes, rather than learning among a classroom of dc all the same age as them (give or take a year). Many research studies support that the home is the best place to socialize dc.
So, I agree that half-speed LHFHG would be a good fit for ds. You can also get Beyond to use for any LA/math skills you feel he is needing something more for - like the Emerging Reader's Set for sure. The answers your ds is giving are not that different than the ones my dc gave when beginning to try to comprehend what they are reading. Imagine learning to read a foreign language - first we would just have to focus on being able to read it. Being able to truly comprehend it would be a later skill that can better be learned once basic reading skills are more solidified. The ERS is scheduled in bite-sized pieces, with comprehension questions based on Bloom's Taxonomy. The questions build upon one another, and done properly in the order they are planned, build excellent reading comprehension. Likewise, the narration type questions that are asked begin to teach introductory narration skills. I stress "introductory", as narration skills are something dc need years to learn. Just expect narration to go very, very slowly to begin with, and be sure to accept whatever he is giving you, mentioning several compliments and one thing to work upon. The section that explains oral narration skills in the back of Beyond is outstanding, and really makes the process clear. In case this is helpful, here is a link to some ideas for going half-speed:
How does half-speed look in your home?
viewtopic.php?f=6&t=5600&p=41232#p41232
HTH, and may the Lord help make clear what is best for your ds!
In Christ,
Julie