Im not sure if this is the best place to post this so point me in the right direction if this should be posted elsewhere. 
Im using a Giotto premium and have managed to fairly consistenly pull good shots with the double portafilter but dont seem to be able to manage the same result with the single. To me it looks as if the grind needs to be different for each portafilter. Ive done my best to be consistent with the basket filling technique, tamping etc. Im aided by the fact that the baskets that came with the Giotto are marked with a line where the tamp should finish. With the double basket Ive adjusted the grind to get a good shot of 2 lots of 25ml in 25 sec out of the Giotto but with the single portafilter it dribbles out and I cant seem to get my 25ml in less than 40 sec using the same grind as I use in the double.
Ive just ordered a tamp shelf to ensure that another variable is eliminated and Ill be very interested (despite some scepticism) to see if that makes a difference.
Has anyone else experienced something similar? Can anyone suggest something that I might be missing?

Im using a Giotto premium and have managed to fairly consistenly pull good shots with the double portafilter but dont seem to be able to manage the same result with the single. To me it looks as if the grind needs to be different for each portafilter. Ive done my best to be consistent with the basket filling technique, tamping etc. Im aided by the fact that the baskets that came with the Giotto are marked with a line where the tamp should finish. With the double basket Ive adjusted the grind to get a good shot of 2 lots of 25ml in 25 sec out of the Giotto but with the single portafilter it dribbles out and I cant seem to get my 25ml in less than 40 sec using the same grind as I use in the double.
Ive just ordered a tamp shelf to ensure that another variable is eliminated and Ill be very interested (despite some scepticism) to see if that makes a difference.
Has anyone else experienced something similar? Can anyone suggest something that I might be missing?

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