Is the ccnode window displaying new block announcements every 15-20 seconds?  What is the age of these blocks when they arrive? (The block age is the number on the far right column of the new block announcement--note that number will only be accurate if the clock on the computer is set accurately, so please check the computer clock with https://time.gov/ or a similar resource).  Is the ccwallet window reporting that mint transactions are being submitted?  How many threads are reporting mint transactions, and how long does it take to create each mint transaction?