If they are new strings they are also still stretching, so keep checking if they are still in tuned "open". Could take a couple days for them to settle, depending on how much you play. I'd wait til they have set and then check intonation just to be sure. Yes, you are looking for GCEA in the green. If anything, check out the Uke Tech and Uke Luthier Forums on here for info setups.