Do you have a dosing ring? This has transformed the tendency of my shots to channel. Initially I got one to save a few seconds using a teaspoon to get the coffee from grinder container to basket, but actually you can give it a quick shake side-to-side to loosen the grounds from the container which also breaks up the clumps and when you dump it into the basket it goes in almost completely level. Tamp lightly with the ring in place, tap the side to get the stuck grounds to fall in and then do your final tamp.
Key thing is not to bang the tamp down in one go. This was something important Steve Peel said years ago on here: don't bang it down in one go. Tamp lightly, back off and have a look and check your puck, adjust your angle or whatever and then go in for your final tamp. I think this is a very important skill to learn rather than relying on a specific piece of kit to control your tamp.
Do you have a dosing ring? This has transformed the tendency of my shots to channel. Initially I got one to save a few seconds using a teaspoon to get the coffee from grinder container to basket, but actually you can give it a quick shake side-to-side to loosen the grounds from the container which also breaks up the clumps and when you dump it into the basket it goes in almost completely level. Tamp lightly with the ring in place, tap the side to get the stuck grounds to fall in and then do your final tamp.
Key thing is not to bang the tamp down in one go. This was something important Steve Peel said years ago on here: don't bang it down in one go. Tamp lightly, back off and have a look and check your puck, adjust your angle or whatever and then go in for your final tamp. I think this is a very important skill to learn rather than relying on a specific piece of kit to control your tamp.