Unfortunately, we are not able to switch the line to Annex M on our IP Broadband services, which run through AT&T's infrastructure and IP network, so we wouldn't be able to that in this case. This is a Fiber to the Node service, so the 20mbps download and 1mbps the full speed possible for us to provide. If you do need more upload bandwidth, the upgrade to 50mbps download and 6mbps is going to be the most bandwidth we can offer until FTTH becomes available.
I don't see any plans for Sonic's Fiber expanding to that area yet, however we also can resell AT&T's FTTH as well and they might reach you before we do. So if AT&T updates the infrastructure in your area to FTTH before Sonic does, we will be able to upgrade your service to the full symmetric gigabit as well.
If you want to try the 50mbps/6mbps upgrade to see if it helps in the meantime, please let us know and we can get the process started on that.