Math games reflection

I have completed ten weeks of implementing math games and number sense activities in the classroom. I have seen considerable progress with students solving facts quicker than in the past. A few students are able to solve them without the use of their fingers. However, several students still use fingers to solve addition facts.
Two weeks ago I introduced a game called the Human Calculator. Students seemed to enjoy this game and still choose this one on Fridays when they are given a choice. What other games will keep students motivated and excited about using math facts? How will students so with subtraction top-it?
In looking back at my oral and written assessments, we have made considerable progress since day one. In the beginning of the year there were zero students who were able to recall more than 20 addition facts on the written timed test. As of November 7, there were seven students who had 20 or more.  In looking at the oral assessments, there were 3 students who could recall 20 or more addition facts but now there are 11 students.
However, I am concerned about 4 students who are making limited progress as they are still in the single digits. What can I do to help these students show more progress? They started out only answering 0-3 facts in September and now are up to 5-7 facts. I have been trying to work with these students more during our math game time to make sure they are on task and completing the activities. From my observations, these students have made considerable gains and can answer a few facts without the use of their fingers. But we have a ways to go. Three of these students are also receiving services for reading and math as they have qualified for title one and math assistance.
I am excited to continue working with math games and to see where my student's progress will go. I believe I have three more weeks of math games and building number sense and then I will wrap things up with a final post test and post surveys.
I feel that even though I will wrap up my action research, I still will continue this in my classroom as I have seem some positive progress.