Poor distribution of the grounds before tamping often causes channelling and those spurts.
Distributed the grounds by expertly knocking the basket against the wall and the difference is stunning. Cheers!
Makes me wonder why I didnt think of this myself, but hey ho.
There are better ways to distribute, knocking can create layering in the puck which can also lead to channelling. But what you are doing will be better than tamping an offset mound.
@Tijmen started
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Poor distribution of the grounds before tamping often causes channelling and those spurts.