I can only speak from my personal experience with my "severely dyslexic" son. He had been in public school for 6 years (repeated K) and was just finish 4th grade with an IEP, and could read a total of nine words!
At this point I didn't even know homeschooling was an option. I decided I was going to get my kid reading, even if it killed us both. It's a big joke at home now, but at the time I remember wondering if my son would ever read. Barton wasn't really an option.
I worked with him over summer. We live in a very rural area of Northern California, and OG help doesn't exist in our area. I knew it was up to me to get him reading. I started out with the basics, the sounds letters make. We practiced this all summer and into the fall with Dancing Bears. He really struggled with the flash cards, and most pages of Dancing Bears. I wouldn't move on until he could get the page down. Sometimes we'd repeat a single page all week. I've read it'll take a "normal" kid 20 repititions to have something stick, but it could take a kid with dyslexia 100+ repititions. I think it took my boy several 100 repititions.
The fall of 5th grade he was reevalutated at his public school, and had gone up an entire reading level, all from our work at home. I pulled him from school at the end of Oct in 5th grade. He's now in 6th grade and is reading at a 3rd grade level. So in 1.5 years of working with him at home he's gone up three grade levels in reading.
My advice would be to keep working with something until your child fully grasps it. Don't move on. I know this can get boring but I think it's necessary. Then again I'm just a mom who was desperate to get her boy reading...