To answer the thrust question we would typically be at around 55% as a general rule of N1 over the numbers in an A320/1. Bit less if we are light and a bit more if heavy. Never anything like 70% though. The spool up times aren't an issue for a go around. There is bag loads of thrust and if anything you will often find yourself having to pull the levers back so that you do not bust the go around altitude and over speed the flaps.