One thing you could look into in the interim is virtual memory.
By default Windows manages it automatically, and is fairly conservative with it.
It will create a rather small page file on the OS drive.
It will grow it later if needed but such operations may cause stutter if they happen the middle of a flight.
You can customize your virtual memory settings under advanced system options on each drive and set it to a generous fixed size.
It is often advisable to have the page file on the fastest drive.
When you open advanced system settings, it looks like this:
You could set the page file it to 0 on the SATA SSD and create a new one on the NVME, since it’s faster.
Mine is set at 32GB but it’s probably overkill.
The rule of thumb is 1.5xRAM.