I like the new puzzles, although I also agree that some of them are more difficult. I spent over four hours on one (I just hated the idea of losing 100% solve rate) and had come to the conclusion that there was just no correct answer. After I walked away for a while and came back I was able to solve it.
What really helps is paying close attention to the clues that indicate precedence along with the increment number -- for example 'Volcano X erupted 9 years before Volcano Y.' If the increment is 3 years, you enter 3 Xs in opposite sides for each volcano. Very often those are the clues that help you solve a puzzle.