[Quiteria]

I think Sally Shaywitz had suggestions in her book Overcoming Dyslexia. I know a big one was computer based, but I remember there being a whole chapter on fluency, so I think there should have been some paper methods described.

I would read the AAR readers that are at his decoding level. I believe the strategy is to re-read, aloud, taking turns. So, something like he decodes aloud, you read aloud the same passage while he looks, he reads aloud the same passage, etc. I think the Shaywitz book might explain better. Maybe a silent reading before the steps above.

You can buy the AAR readers separately, or buy the levels for the 8yo but only make the 11yo do the fluency activities if you're positive he's past the decoding lessons/activities. Or you could use any decodable controlled text up to where his lessons left off.

Barton recommends a minimum of 2hrs/week on their program which covers reading/spelling and eventually grammar. Some people do two 15min sessions a day for kids who can't focus through longer. You could do one fluency session and one decoding/encoding session, perhaps. But less than 2hr/wk may not be enough to gain traction on improving.

For writing, speech-to-text often doesn't work well that young, but you could incorporate some copywork from what he's reading, specifically decodable. Beyond that into writing skills, I would try to rotate through kids...each of them getting a little writing workshop time to work with you on capturing and developing thoughts (you jot down for the dyslexic ones). Some people squeeze it in one kid per day and rotate through the bunch, others devote a whole day periodically where THAT is the individual time with you for each child, one after another.