EDIT* After going home tonight with a plan to try the light tamp, I think I solved my issue. Because I was going to tamp lighter, I thought I should grind one notch finer, I did this, but then decided to tamp as I normally would...the espresso was great! My issue was grind (duh). I followed this shot with a very light tamp, didn't change grind, shot was bad (maybe a finer grind would've worked?). Anyway, with my machine I believe my best chance at a good shot is to select a grind so when the shot extracts it dribles for a while, then the mouse tails kick in, it never gushes, and I cut it at first sign of blonding (1.5-2 oz).
I would appreciate some comments on my situation. In the end I may try tamping differently than I normally do, but thought that I would describe my routine and see if changing tamping is the first place to start. Bit of a long post, but wouldn't you rather help me than continue the back-and-forth with the other home barista
Equipment: Brasilia club (I've heard it's similar to a silvia), double basket, rocky dl, reg barber tamper, black cat beans 9 days after roast (I often have other home-roasted blends on the go, including SM Monkey)
Routine:
- 30-60 mins pre-heat
- run a couple of ounces through the group/pf/basket into my espresso cup
- remove basket from PF, dry, put yogurt cup in basket, grind
- dosed by volume, most often the loose coffee sits just above the rim
- use a pin to stir the grinds (if too much coffee, I level with a straight edge)
- light tamp, light nutating tamp, hard tamp
- lock and load
- stop the shot when blonding appears
Result - I really enjoy 1/2 the shots, other 1/2 are drinkable.
I would like to get more consistent shots with the equipment I have. I think I'm executing the routine consistently each time, but for whatever reason the results change. How should I approach this? Tamping, seems to me like an obvious "something I can change and see if it works", but given my equipment, a change in routine may result in a better or worse shot for another reason (hardest thing, I believe, for us with modest equipment). Also, I don't like to play around with changes because I don't have time. One shot a night...try and remember the grind setting for the next day based on today's grind and the results.
Also, a specific question - sometimes when doing the light/5# tamp I 'feel' that the coffee isn't distributed evenly, should I re-distribute the grinds at this point and then try the light tamp again? The "try to fix it with the tamper", which I've done, is probably a bad idea
Thanks.