I have been working with class numbers for next year. This is my latest attempt and nothing is final. We still have to make it through District predictions and negotiations to maintain our 17 FTE. BUT, lets use these as a starting point for conversations.
Here is the obvious: Large classes for first grade is definitely not optimum, third grade looks small but this is a tough bunch of students and a year that has IRI and ISAT benchmarks to meet, we would need to add a teacher at third grade (replacing Tracy's FTE)

Grade        FTE       Ratio
  K              2           1:20     + L21C
  1               3           1:27
  2              3.5         1:24
  3              3.5         1:23
  4              2.5         1:26
  5              2.5         1:31