Good list, Andre. I would add step (0.5), confirm there is no channeling, ideally with a bottomless portafilter. Refer to the reliable 1, 2, 3 punch for diagnosis tips and the Home Barista's Guide to Espresso for everything else.
Hmm good point. If the Gaggia Classic is a 58mm still, then it's a likely possibility as well.
For that step I would first try a finer grind (even still!) and virtually no tamp (just the weight of the tamper). As well as some inoculation on the WDT. All of which can be confirmed or denied (as mentioned) by the use or purchase of a bottomless portafilter.
But it still goes back to the main question of the taste...if it tastes great but blonds early. 1&2 are your roads to success. Hope you get some ideas!
Ecco reserve espresso. I did not post this morning b/c my results were so dismal I figured I had some work to do before coming back for help......definite channeling, then nasty flavor. Still trying to get the grind right on these beans, so any thoughts on that would help.
Thank you. That will be my goal in the morning. I dont have much control over temperature. Starting to get more convinced that is the problem, but I will keep trying to get better control of everything else.