If you haven't had the opportunity to visit SSKindergarten, you are missing some great resources for both K and First! She has an amazing blog post on fluency that I've "tweaked" for the Reading Street program. I've used it for the last two weeks and it's been really good for my OL group. My SI group just started last week and has shown moderate success. It all depends upon how much the parents help them at home too.
It incorporates high frequency words and phonetic skills we're working on in each story, so I don't know how it would work for someone not using Reading Street....however, you may be able to adapt it to use with your program????
Thanks to Sherry at SSKindergarten for letting me share with you!