Thanks for you answer namelessone you could be right.
My burrs touch at 2D.
I cleaned up my grinder and just tried to brew a cup of coffee using the aeropress with Tim Wendleboe recipe (link here: http://www.youtube.com/watch?v=ggCK_oOS_08
The coffee I used is East Timor Duhoho from RAVE (respected UK roaster, more info on the coffee here: https://ravecoffee.co.uk/products/organ ... rticalTab3
It's a light roast, fully washed. On the package the tasting notes are Raspberry, Pepper, Lemon and chocolate. I had one espresso this morning on my La Pavoni and it was delicious, very complex sweet coffee.
I used water at 95C (203F) like the recipe says. Grinded 14g at 4K on my grinder (not sure if you can get an idea but took some pictures of the grounds). I single dosed it (hopper not full)
The tap water near Paris is very hard so I usually brew with Volvic:
Calcium (Ca) 11.5
Chloride (Cl) 13.5
Bicarbonate (HCO3) 71
Magnesium (Mg) 8
Nitrate (NO3) 6.3
Potassium (K) 6.2
Silica (SiO2) 31.7
Sodium (Na) 11.6
TDS 109 (dry residue 130)
I waited it to cool down and tasted, it's very muted. If it was under extracted, from my experience with brewing it in espresso, this coffee should taste very acidic. My brew is neither acidic nor bitter just very muted. That's why I believe I could be under/over extracting at the same time.
One review from this coffee tells "Perfect for pour over, beautifully bright and light". Far from what I'm getting with my brew
This is how the puck looked. Looking more carefully now I believe the grounds should be finer at 4K. This look pretty large to me. Again the coffee should taste very acidic if under extracted.
I have similar results with different kinds of coffees (either light or medium dark roasts). Also tried v60, cupping and French press nothing really interesting out of it.
Thank you very much for your answer a lot of useful information here.
I cleaned it up again and vacuumed the grounds. I had a lot of grounds accumulated under the lower burr, not sure if this is normal:
Even without the lower burr the carrier still is out of balance, similar to the video I posted.
I did the pen test this is how the lower burr looks after it, I'm not sure what is the conclusion here.