Number of rounds and battlefield size
Increasing the number of battles per batch from 10 to, maybe 350, can workaround the issue of constant uploads.
Testing locally, I noticed 1 round and 3 rounds have a lot of difference. Combat does about 45% average against Seraphim in 3 rounds, and about 18% average in 1 round. Uploading lots of battles averages out unlucky positions.
And its funny to see the client console scrolling with a lot of battle results popping up fast.