I was in the exact same situation as you. I had a mini and upgraded to a large conical. I ended up with a kony-e. I have since started working as a trainee barista part-time and have used the K10 WBC as well as a Robur and some BNZ grinders. Are you looking at the kony-e or the doser version? The K10 doser sweeps really clean, which is an excellent feature. You may experience some clumping with doserless grinders like the Mazzer E range. I am glad I went for the grinder I did at home. I am sure you will be happy whichever way you. No doubt there are equally good large conical options as well. I do go through more coffee at home since upgrading, the Kony holds more in the throat than the mini so some wastage is par for the course in my opinion. Worth it though.
I cant comment on the K10 hopper issue as I have had no experience with that.