I just drilled the case so that the trimpot can be tweaked. I also took the 'lid' off the photocell housing, stuck some reflective foil on and replaced it- this apparently increases the intensity of the effect. I found the best setting on the trimpot was just shy of fully clockwise for the 'Bridge of Sighs'/ Hendrix at Woodstock throb..
Bit of an update to my board. I've added a Hardwire delay, and shifted on a Malekko delay I used to have. Kept one of them like though. Also added the Nova Modulator, and relabelled the pedal switchers and commander!