number 13 doesnt make sense, instead of going to h5, just go back to h6 for a repitition
under number 15, all the moves are not forced
Sorry for hating so much, but most of these problems are self damaging for one side as nobody would ever play as stupid as the people that you show in your problems. I would suggest you create problems that actually have a reasonable answer and response, otherwise I have nothing postive to say about you and your problems. Have a nice day.