Single Bitmap for Aggregate calculation

Hi,
I am aggregating a few of my dimensions and Essbase is taking only a single bitmap and taking about 6min to my aggregating which is not ok. Here are the details;
Number of dimensions=13
Dense Dimensions
D1
D2
D3
D4
Block Size = 1376256 B
Aggregating Sparse Dimensions and number of members
SA1=19
SA2=28
SA3=56
SA4=245
SA5=382
SA6=384
Non-Aggregating Sparse Dimensions and number of members
S1=2
S2=5
S3=34
Order of Dimensions
D1
D2
D3
D4
SA1
SA2
SA3
SA4
SA5
SA6
S1
S2
S3
So I have my order of dimensions good.
Caches
Index=8000 K
Data = 300000 k
So essentially I can fit 111 blocks in my Data Cache, all good.
My Calc cache is 200MB!
Heres the calc scripts I am running;
//ESS_LOCALE English_UnitedStates.Latin1@Binary
SET MSG SUMMARY;
SET CACHE HIGH;
SET UPDATECALC OFF;
SET LOCKBLOCK Default;
SET AGGMISSG ON;
SET CALCPARALLEL 2;
SET CREATENONMISSINGBLK OFF;
FIX(USA,USD, General)
AGG("Employee Grade",Futures,"cost Centers",Trials,"Employee");
ENDFIX
So, I am only trying to fit SA1, SA2, SA3, SA4 and SA5 in my bitmap, I am fixing on a single member from SA6.
So, my bitmap size=19*28*56*245*382/8=348529160 B~332MB
Number of bitmaps =40
So my required calc cache= 332*40 =13280 MB which much later than the max Calc Cache of 200MB!
Is there anything else I can do to further reduce my aggreagating time?
Appreciate your responses!
Thanks

I found I made an error in calculating the calc cache
So, I am only trying to fit SA1, SA2, SA3, SA4 in my bitmap as my bitmap dimensions, as SA5 becomes the anchoring dimension and I am fixing on a single member from SA6 (sparse dimension).
So, my bitmap size=19*28*56*245/8=912380 B = 0.87 MB
Number of bitmaps =40
So my required calc cache= 0.87*40 =34 MB which much "SMALLER" than the max Calc Cache of 200MB!
So, why is Essbase still using a single bitmap? Have I calculated this wrong or am I missing something?
I would really like to reduce this calc time?
Please suggest!
Thanks

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