Are you still mining with google drive? I'm plotting and uploading to gsuite unlimited, half a terabyte after a couple of days. Takes me a long time because the cpu is old (4400 nonces/second) and the hdd has only 70gb free for plots.
Network speeds are 100 up/down, most of the time BlagoMiner reads the plot at 2.5 to 3MB/s but I have seen it read at 20 or 30 MB/s, sometimes it works better with Netdrive and sometimes it goes faster with Google File Stream.
I don't mine Burst anymore at all. If you're considering trying more tests, I'd love to see your end results! :D