I am guessing you synced the Master branch, correct? As I mentioned previously, the Master branch is untested. It is also unoptimized. It is not unusual for it to be a bit larger in size than the release branch.
I am not sure what is going on with the shaders and Intellisense that you see there. If you have not already done so, could you please make a new AnswerHub post for each of those issues so we can look into those more closely? I do know that Microsoft has made some improvements to Intellisense lately, which should allow it to work better with UE4 specifically.