Welcome to the board mate and it's great to see you reading up on the topic. To answer your questions:
1. Four days is ridiculously early to make any judgements on any prohormone. The body cannot synthesize protein that quickly. You should begin to notice something around two weeks in.
2. I wouldn't use nanodrol for now.
3. Prohormone cycles increase insulin sensitivity making a high carb, high protein lowish fat diet optimal imo.