The things you mentioned are just discipline things. The only way to fix them is repetitive practice til you get it right. There is no "trick" to keeping the nose wheel up.. just remember to keep the nosewheel up. No real trick to landing soft except doing it over and over til you get teh feel for it. I would say one more flight with a short tempered instructor would just be a waste of money. However, if teh school will allow you to go up with another instructor, it may worth the time and money as you would get a different persepctive. My guess is that this guy wont fail you on a soft field procedure, they need you moving on to yoru instrument training so the flight school can keep making money.