I am a firm believer in letting Windows manage computer resources as it wishes. The more I learn of how it works the more I believe that this is true. Manual intervention is almost always harmful. Windows memory management is extremely complex. It has been the subject of extensive research, development and testing for many years. The goal is always to assign memory where it will do the most good for overall system performance. If you think that your situation is somehow unique, something that Windows designers never considered, then you are only fooling yourself.
You can disable the pagefile, create a RAMDisk, put the pagefile on the RAMDisk, disable this, change that setting. After you have done all of that, and more, you will almost certainly have a system that performs no better than it did before, and it may well be worse.
Adding more memory will improve performance. But there will always be a point of diminishing returns where adding more memory does little or nothing. I expect that for your workload 8 GB RAM is past that point. That being the case, nothing you can do with memory will significantly improve performance.
An SSD will likely do more than anything you could do with RAM.