Heap size memory error on WebI Reports

Hello,
I'm developping my own JDBC driver to report specific data in Business Objects. I've actually an universe build on this driver and a web intelligence report. When I try to request I've an heap size error due to the size of my jvm. My JBDC driver is deployed thanks to a jar file. Normally I can increase jvm size with the argument -Xmx256M in command-line.
I tried several things :
I modified register HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Session Manager/Subsystems, SharedSection to 1024,3072,1024
I passed Tomcat's memory to 1024, I can't more because I'm on 32 bits on Windows Server 2003.
I tried to add MAX_HEAP_SIZE=1024000000 on webi.properties in c:\programfiles\Tomcat\webapps\businessobjects\enterprise115\desktoplaunch\WEB-INF\classes\, as explained on a post,but this directory doesn't exist, but there is 4 different webi.properties files one in C:\Program Files\Business Objects\Tomcat55\webapps\PerformanceManagement\WEB-INF\lib so I added max heap size parameter in this one.
I improved my JDBC-driver to avoid memory leak, and BO requests to limit results.
But I still have an heap size error.
Some people have other ideas to solve my problem ?
Best regards.
BO XI 3.1 Service Pack 2 HotFix 1
Tomcat 5.5 : 1024Mo memory allocation
Windows Server 2003 32bits

Hi Hizam,
1. Go to universe and click on View--> Structure
2. Check objects and Conditions.
3. If you found any changes then re-export your universe and run queries.
Once everything goes fine then Schedule the report.
Hope it helps you....!!
Thank You!

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