I like the design of spiritual focus, although 0.3 seconds for 2 chi is not a lot.
But drinking horn cover just does not work that well, because the duration increase does not scale at all with how many chi you are using, so whether you use fists of fury, blackout kick or rising sun, they all increase the duration by 0.3 second, which is honestly not a lot regardless.
Id say that it should be 0.3 or 0.2 seconds for each chi spent.
Ww monk is still strong though so.