There is no reason to do single rider or "save" your FP+ for later. We're a family of 5...and we even stay offsite with APs so we're very limited in FP+ selection in advance.
On Monday, use your FP+ in AK for the things you really want. FoP, etc... You will have very little trouble getting additional FP+ for most things in HS. The hard ones would be the stuff in TSL. However, even if you can't get SDD or TSMM, the lines drop significantly at the end of the night. TSMM is literally a walk on, and SDD line is short. The only wrinkle I could see would be if you wanted to see Fantasmic. Then you'd have to make a choice, potentially (you may still be able to get FP+ for SDD or TSMM)
Tuesday is a breeze. Use FP+ all the way at MK. If you're going to Epcot in the evening you can get pretty much anything. TT is the hardest to get, but even that isn't super hard. Soarin' is a walk on late at night and FEA line is short too. No need for single rider at TT.