Umm.... How are you using the doser....?
You're not filling it up with ground coffee are you?
IF not, then forgive the next bit..
..When you use a doser at home, you're still only grinding what you need, for ONE shot at a time. No more, no less.
Some people like to weigh out the beans for each shot(Im one of these people), add them to the grinder, and turn it on. As the beans are being ground, you "Thwack" the doser lever. This puts small amounts at a time into the filter basket, so you can get an even density of coffee. NO ONE who is after the highest quality cup, either at home or in a commercial setting, EVER fills up the doser with coffee.
Regardless of whether you keep the hopper entirely full of beans, or you add only a shots worth of beans to the grinder at a time, you are still only grinding for one shot at a time.
I often see people on CoffeeGeek say, "Well, I dont want a doser, because I dont make a lot of coffee". While I think the debate of doserless vs. doser'd has good arguments on both sides, the above comment is hogwash. Whether you make one shot a day, or 30 shots a day, it makes no difference, and shouldn't be the reason you choose between a doser'd or doserless grinder.
Here is a
Link to a youtube video, showing what I mean. Note that the person in the video uses the hopper with an amount of beans in it. If you weighed/added per shot, you would do the same thing, and just let the grinder grind em all up.
If this is how you are already using the doser, forgive me. There is often confusion surrounding doser grinders and not "making a lot of coffee".
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As for Mod's to the Mazzer...
Ask anybody who owns a Mazzer grinder with a doser. Whether its a Mini, a Major, a Kony or a Robur, most all of them will tell you there are two mods which should be done immediately. Three if you bought it brand new.
If you bought it brand new... Remove the metal finger guard inside the doser, which blocks access to the exit chute. Youll need to be able to get at the exit chute to brush it out.
The two mods:
The "Sweeper" Mod, outlined
HereThe Schectermatic Schnozzola, outlined
Here.(This is the link to the thread... There is a link to the PDF file to print out the template in the first post)
You MIGHT find that the sweeper mod isn't 100% necessary. Ive read a few posts here and there, where some users didn't find it crucial. However, the "Schnoz" is a wonderful, WONDERFUL addition to the mazzer doser's. I wouldn't be caught without my schnoz installed, and another two sheets already printed out for backups. I used Card Stock to print out the PDF of the Schnoz's.
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Now, keep in mind, the Mini is on the slower side, when it comes to grind speed. The downside to that, is that its slow. The upside to that, is you can keep an amount of beans in the hopper, and you will have a much easier time only grinding what you need. On my Major, Its impossible for me to not grind way too much coffee, if Im dosing at the same time. That said, you might want to go check out the threads on single-shot dosing VS. Keeping a bean column(beans in the hopper). Good points on both sides.