I'll take your numbers, 11.6 w/ PS and 13.33 w/ Asc.
11.6 nets you 696 energy/min, for 17.4 chi producing attacks. 7 of those will be KS, the other 10 jab/expel, for 24 chi plus 3 from PS for 27 chi.
13.33 nets you 800 energy/min, for 20 chi producing attacks. 7 KS, 13 jab/expel, for 27 chi.
Using your numbers, Power Strikes gives you 1 extra chi every 2 and a half minutes over Ascension with the same haste rating. That amount of chi is negligible over the course of a fight and having faster resources and the ability to bank more chi more than makes up for the 1 extra PB every 2.5 min.
It doesn't really matter how we compare, the end result is going to be the same. Yes you get a tiny but more chi, but you have other benefits that you trade that for.