Well, what is your conversion eff? What is your lauter eff? If you dont know those 2 numbers, it is hard to say what your problem is, if you dont know WHERE it is.
Also, wouldnt your candi sugar increase your SG a bit? That wasnt in there when you took the sample, right?
ProMash shows your Pre Boil gravity at about 1.062, at 76% Eff with your grain bill at 7.0 gallons pre boil. This leaves you with a POST boil of 1.086... but then you have to add the Candi Sugar in the boil.
You really cannot look at brewhouse eff. and start to troubleshoot a process. You need to get your conversion eff. and lauter eff. numbers, then you can look at the process.