OP specifically mentioned issues with exposures not looking on the screen like lightroom when he gets home.
Thus, the best way to see this in the field is to very simply run lightroom, not some other program that may display differently than lightroom as well.
Plenty of Windows 8.1 tablets out now that can run real Lightroom - Surface Pro 2, Dell Venue Pro 11, Asus T100TA (weighs about same as ipad air), etc... Why gimp oneself with an iPad viewer or look at JPGs when you can actually get the real deal in Lightroom, viewing AND editing if you wish?
I actually ran a photo booth in the field using Lightroom on the T100TA, worked really well! Basically if you get a Haswell Y CPU tablet, you will get around 7-8hrs battery life and super fast lightroom. If you get an Intel Atom Bay Trail Quad Core, you will get good enough Lightroom (this is what I used) and about 11-16 hours of battery life depending on the model.