1. Imagine filling a 10 gallon bucket. You can fill it fast, or you can fill it slow. Either way - it only holds 10 gallons. What KCC try and do is make the process last around 10 months - 1 gallon a month you could say. Spreading the interviews out over the year means the most efficient use of the resources at the embassies, and also allows for people that submit their DS260 late - but have a lowish number. So - KCC will know that they need about 90 to 100 interviews per month in OC region. That number will yield enough approvals to use the OC quota. So - if 25% of cases have their DS260s process, you need a VB number of about 400 in month 1. If 50% of the first 200 cases have finished processing though - you only need 180/190 case numbers. Regardless of the pace, the bucket isn't any bigger or smaller. They have about 800 visas in OC (derivatives included). 100 interviews per month is MORE than enough to get there. As for your number - you have no reason to worry.
2. No.