i have owned and tried most of those shafts. i at one point had the shimada k7001, nippon 1050 in my af701s. first of all the k7001s are very good lightweight shafts but i found them to have excessive vibrations which i did not get along with. ball flight was very good and tended to balloon less than the nspro1050. the nspro had excellent feel and feedback but found the ballflight very high. i actually preferr the nspro 950 over this.
for what its worth i have shifted to a tour ad75 and has made a world of difference in my game. feel is buttery and lively and these certainly feel like soft steel. not the whippy kind of graphites you are used to. you should defintely consider these. good luck