ferrum wrote:Pardon my ignorance but what exactly to you mean by "nutate" ???? as far as my english goes, but I understand "nutate" as to make a circular "wobbly" motion or something along that line...
if you don't mind, but please go in-depth about what exactly you mean with nutate in combination with a DC Mini and coffee...

Not to worry... English is my native language and I've been a voracious reader since I was a young child - yet I have never seen the wodr in print prior to this post and had no clue as to the meaning.

Free online dictionary says:

Verb 1. nutate - rock, sway, or nod; usually involuntarily
rock, sway, shake - move back and forth or sideways; "the ship was rocking"; "the tall building swayed"; "She rocked back and forth on her feet"

It's also worth mentioning that your dilemma shows the value of a bottomless portafilter as a training tool. For many people the jury is out on whether the bottomless actually produces a better shot but there's no question that it reveals issues or problems with distribution and extraction far more readily and visibly that a spouted portafilter does.

ferrum wrote:@marshall
I'll give that a try... but I need a more precise small scale to measure it exactly.

I should mention that "precise" measurement is unnecessary. I keep my hopper reasonably full, which avoids popcorning and permits me to dose by time. When I finally weighed the dose that made me happy, it turned out to be about 15 grams, but I actually control it by my timer.

I have a high tech manually articulated organic composite timer with an ocular transducer and it gets me a +/-0.2 gram dose every time(thumb and eye). But I have been doing it for a few years which helps. A scale is useful to get yourself trained and as an occasional double check. After a while you will grow beyond needing it but it helps during that learning phase.