pressure
 

hi,
I read and heard that the right pressure for a good 3cl espresso shot
is about 9 bars. The machine I have has 15 bars fixed which means that
if I observe the right time of brewing (say 25 seconds) the shot comes
out too long. Do you think that stopping the pump halfway the brewing
cycle for a couple of seconds, thus prolonging the brewing time(?), can
do the job?
thanks for any help