If you are able to work on just the shot...
well for me a double shot is supposed to be about 24 secs i think????
The one I uploaded is pretty close to a good timing so you can work off that one.
If it's too fast, try making the grind a little finer, and the opposite for too slow, a little coarser.
I doubt you have control over the pressure of tamping the coffee biscuit, so just go for that.
I find if it's too slow, i usually wait it out, even if 40 secs and drink it anyway, but it's far too bitter !
Too fast, and it's just light coloured water, might as well have instant
Good luck!
Oh, Dino, just using a local store at the moment.
It's a blend, of what I don't know but it's one of the best I've had for awhile.
Loo Loo's Coffee in Kincumber NSW
http://www.loolooscoffeewarehouse.com/