Did you play with "Run task: After/Before profile archive import" or "Run asynchronously"? Maybe changing these settings may give you more realiable results.
Regarding the general use of UEM and linked clones, are there any specific things you run into? Or do you have any specific questions?
I posted a blog article regarding linked clones, UEM and App Volumes a couple of weeks ago --> Search Results for “jmp” – IVANDEMES
Please let me know if you have any specific questions.