That fix is related only to the "Desktop HEAP", which is an entirely different thing of the Virtual Address Space.
The VAS is measured in GB, and it's 4GB per app on a 64 bit OS running 32 bit apps. The Desktop Heap is measured in MB and it's a storage for desktop objects like menus, icons, etc. It's possible you applied the fix in the wrong way, for a 32 bit OS, so you actually *decreased* the default value for a 64 bit OS, which is 20MB.
Check your registry and see what that fix set this value to, your link on Microsoft discusses the registry keys involved, the most important one is this:
SharedSection=1024,xxxxx,512
the xxxxx defaults to 20480 (20MB) on a 64 bit OS, be sure is not set to a lower value now.
Since this memory allocates space for cursors, icons, pens, menus, etc, if you are getting OOM because of it, it seems you are simply running too many program at the same time OR some of your addons is LEAKING GDI resources, like creating pens and not destroying properly.