Hello.
Take these answers as they are just suggestions and opinions.
dgasmd wrote:1. Length/duration of the extraction. I have a mini with the pre-infusion chamber option. I have read here and in other places the "mini likes" longer extraction times (32-35 sec vs 25-27 sec) when compared to other machines. So, when should I start my timer:
a. when I press the button for the double (60 cc volume)
b. when I first see the drops forming on the bottomless portafilter
Always start the timer at the moment that you press the machine's button. You may want to adjust the time on your timer based on pre-infusion or your personal preferences. The beading time will change from coffee to coffee, grind finess and tamping pressure.
dgasmd wrote:2. How do you alter recommended parameters given by the vendors for a particular coffee? I read a lot that on these machines a dose of 15 gram is much better than the traditional doses of 17-19 gram. As in the question above, I also see recommendations of using much longer extraction times. So, if the bean roaster of a particular blend says their recommendation is dose of 18 gram, 26 sec extraction time at 200 degrees how should I translate that to my "mini language"?
Well this is easy. I alter to make it taste good!

The standard double basket with a regular thick dispersion block will not allow me to dose anything higher than 15.5 grams. For higher dose a triple basket is required. But I rarely "need" a higher dose to make the coffee good. I will not claim to make my shots "optimal". It is a very subjective thing. Some morning I will like a given blend or SO with a higher dose when the day before I liked the standard 14g better.
If you are not yet convinced of the uselessness of my suggestions by now, lets go to question 3...
dgasmd wrote:3. Storing beans. I read about freezing in jars, vacuum sealing, and such. I was told by one vendor to avoid freezers and refrigeration due to both adding a lot of moisture to the beans, which was very bad. How are you guys doing the freezing? How are you thawing them? Is it OK to use freezer ready zip-lock bags and bleeding all the air out as you lock it? Trying to avoid jars and any other extra equipment if possible.
Well, personally, I use Mason Jars. I fill them to the rim to minimise air space. A jar does not use that much more space and is easier to neatly pile in the freezer. And they are not very expensive.
A Zip-lock bag will do the job for sure, but it may let more exchange with the freezer and is more fragile to pin holes and such.
Thawing is easy; Take the coffee container out of the freezer and let it rest unopened until everything is at the room temperature. This will prevent condensation on the beans.
Hope this helps
Cheers.
Sylvain