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@bombcup
I've just been given an espresso gear convex tamper as a gift and I love it. Nicely ergonomic powder coated alu handle with a very heavy stainless piston. I just really like the convex base as it seems easier for me to get the tamp nicely level. With my dose in a Synesso double basket the top of the piston finishes level with the rim of the basket so by feeling your fingertips across the top of the tamper and the basket rim you know it's square all around. I've now replaced my flat Reg Barber with it.
For the coarse ground espresso problems - if you want to bring the coffee to Maltby St I will check it has been ground correctly and replace it. We calibrate the espresso grind on our commercial machines, but some home machines have their pump pressure set very high, particularly if they originally used a crema-enhancing basket. If the grind checks out OK it may be worth investigating how to turn down the over-pressure valve on your machine.