Currently, I wouldn't say you have mastered hards to begin with. You may feel that they are easy to aim on, but your goal whilst playing is to obtain a full combo coupled with high accuracy. Most of your top plays consist of low accuracy (around 95%). You should be shooting for 98-99%. In the case of playing insanes, if you look at the star rating you can better judge the difficulty of a map. Insanes vary a lot in difficulty and you should look for the easier ones to start with.