Marla,
I think there may be a problem with your test results. The TC (total Chlorine) should always equal FC (free CL) + CC (combined CL). According to the results the FC is 7, TC is 3 and CC is 0 which is not possible. I would double-check these because if the FC is 3 and TC is 7 you have a TON of CC in that pool that needs to be shocked out. Also, I would drain and re-fill to get the CYA below 50. Since you mention wanting to use pucks throughout the summer you might want to get the CYA down to 30.