Looking for suggestion for handling thousands of subs, especially in a mosaic

Hi, 

I shoot short exposures with an Alt/Az Dob.  I get great results, but the one big issue is stacking/data management in APP.  It just chokes on the amount of data for a few reasons:

1) Simply the number of lights can cause issues.   Once I get above 2000-3000 lights, if I get a disruption during stacking such as a frame that doesn't register.  I can't even deselect the frame because the program kind of hangs with the console window constantly cycling through re-displaying the frame list.  It says something like "rebuilding the frame list" or "constructing frames detail list", but I may not have gotten the text right.    Basically it's idle, but can't handle the number of frames in th list.

2) Since I get field rotation, the stacking produces a huge frame.   However, for mosaics, I kind of want that data that is slightly out of the reference frame, it's good data but perhaps I must integrate into the reference frame only.  Sometimes it asks for 1.5TB of disk space!   I'm thinking the best thing here is to integrate at a lower scale (which I'm fine with), perhaps 0.5 for 1/4 the amount of data requirements, is that correct?

My data is already bin2, so 6.5megapixel subs, so not giant, but it can't handle the number of frames not the large integration window from a bit of drift and a lot of field rotation.

So I'm wondering which strategy you would recommend:

1) Stack each panel of the mosaic with full frame integration and then reload the finished panels and stack the whole thing?  Each panel stacks easily, even in full frame integration mode even with scale set to 1

2) Stack a subset of all the frames together to create a bunch of "sub mosaics" and then stack those?  Perhaps with scale <1 to keep data size down.

3) Some other strategy.

When I do smaller sets of data, it works great (good quality results), but it's just choking on the number of subs coupled with the large integration window.

Finally, which of the following options should be set?

Analyze Stars: Set more than 500?

Register: Use triangles versus quads?

Register scale stop:  Set to 15?

Normalization Mode: Advanced?

Integration MBB:  turn on and set to a high percentage?

Finally, if I want to stack at lower resolution, I see that the Scale in Integration can be set to <1 (ex: 0.5), but it can also be set in Registration and Normalization.  Do each of these reduce the resolution and which should I use?   If I set it to 0.5 in each, does it downsample further in each step so it's 0.5*0.5*0.5?

My system is a 64Gig RAM, 8 Core Ryzen 5900, 2.5TB SDD Windows system.

Thanks.