You should definitely lower the amount of new cards you do. Was all 75 lessons new? Because that's just not sustainable, lol. Even if you did manage to do it, retaining that many new kanji/radical/words is very difficult, so you would be getting more wrong and thus have more reviews. I found it very difficult to do more than 20 new cards, and with 20 I get around 300 reviews a day over the course of a year. Good luck!