Hunter : Clarification on Engrave Helm - Catlike Reflexes

Engrave Helm -Catlike Reflexes (https://www.wowhead.com/classic/spell=416083/engrave-helm-catlike-reflexes)** Engrave your helm with the Catlike Reflexes rune:

Increases your chance to dodge by 20% and your pet’s chance to dodge by 9%. In addition, reduces the cooldown of your Kill Command and Flanking Strike abilities by 50%.

I am trying to understand the efficency of this Rune: it reduces the cooldown of Kill command ( which is fine ) and the cooldown of flanking strike too to 15 sec ( 30/2 sec ).

I understand it is only a datamained version of it, but the flanking strike buff timer is 10 sec, so in theory this doesn’t let help us keep the uptime of flanking strike significantly, it is like before and maybe you have a little uptime with one stack up.

Since Kill Command it is not the the most powerful rune, and the proc of flanking strike rather unaffordable shouldn’t the base reduction set to 67%?