I felt really down and depressed when taking on my last job in a new part of the country some twenty one years ago; I just could not get through the work in the time and left hours late every day, feeling pretty useless. Then someone kindly told me that my predecessor had been a grade higher, had less tasks to perform, and worked an additional two hours a day to my contract. They are a crafty lot at times, employers!
I spoke up and asked for the extra hours and an upgrading, which was given without a murmur - in fact one of the senior people said something like 'Why were we expecting this person to get though so much in the time ?' That made me feel so much better, and I'm sure that if you talk to someone now and ask the questions you want to you have nothing to lose and much to gain - you too might get a better leaving arrangement, but if nothing else you will feel that you have said your piece. Incidentally my successor, I discovered while training her, was a grade lower, working an extra hour a day, and earning a third less than me. I told her that on the last day - hoping she too would be fired up to press for a fair situation.