Increasing Deluxe Memory Man delay time

[allmonochrome]

i have an EHX Deluxe Memory Man and, like many of them, my pedal doesn't have the full 550ms of delay time (it has about 390ms). i've been looking at the schematic (old version here: http://www.freeinfosociety.com/electronics/schematics/audio/pictures/electroharmonixdeluxememoryman.gif) and i can think of two ways that might (i think) change the range of the clock frequency of the BBDs, but i'm not sure that both of these methods would work. i think that i can either increase the size of the 5.6k resistor that is in series with the 100k delay pot or i can increase the size of the 240pF cap in between pins 1 and 3 of the cd4047. would both of these methods works? which one would be best?