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Here is a little tip to get 'seriously' tight balls out of the back corner.
When we are trying to get a ball that is this tight to the back corner out what I need to do is swing down into the gap. Here if I take a normal swing plane I am going to catch the back wall. If I swing to this gap here...right down the bottom I can now swing. It is going to bring my racket a bit lower, it is going to bring me up underneath the ball which is also going to help me get it up high and to the back of the court.
Where we are swinging here...here we have got the short side of the triangle. Here is more room...it is the long side of the triangle. This is why it works we can use this area here to swing and dig the ball out.