Riding both rides twice will require waiting in line for quite a bit for the second times around.
I'd keep the FP for Soarin as it has to be the most boring line to stand in.
If you guys must ride both rides twice, then best way imo would be:
-be there early for rope drop and head straight to TT
-then head for Soarin and see if wait times are short enough to wait for. If it is, then do standby.
-After standby, then use your FP to ride a second time
-head to TT and either wait in line or do single rider.
Not sure if you guys want to do both rides back to back like TT,TT,S,S. Or split them up. If you want to ride back to back, then I'd hit Soarin first as it takes longer to get through the line. But only problem with that, if it was me, I'd want to make sure I got on both at least once and not ride the same ride twice, then the other line is a ridiculous wait.