That isn't going to solve you channeling issue (and they aren't e61s, that's a specific HX group model unrelated to piston based espresso machines). You should try increasing you dose, easing up on the grind, and dropping the Fellini move for a bit. You shouldn't have to resort to the Fellini move to get a full shot (a little less than 2x dose weight), if your dose/grind/tamp are on the puck will saturate and the group will fill while you hold the lever up. With a clean LP it should be abundantly clear when water is filling the group and when it has finished.
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