How to reconfigure Essbase database to avoid error 1012700

Hello.

I have an Essbase BSO database that is growing in usage, so I am concerned with fine-tuning the cube to keep the size down and performance fast.  The specifics/settings on the database are:

• Buffer size 100 kb
• 5 dimensions - 2 Dense and 3 sparse.  The Dense dimensions are the Accounts and Time dimensions.
• Block Size is 715008 B; seems very large but is due to there being almost 4,000 accounts.  Potential # of Blocks is 198,900.
• Index Cache = 10,240
• Data File Cache = 500,000
• Data Cache = 500,000
• Storage is Buffered I/O

So what I've been trying is making a copy of the application, changing the Time dimension to Sparse, then stopping and starting the application.  When I attempt to retrieve from Excel I always get the error: "Dynamic calc processor cannot allocate more than [200] blocks from the heap.  Please increase CalcLockBlock setting and retry".  This message corresponds to error 1012700.