SB8200 Modem Not Achieving 100 Mbps Upload Speeds

Hi there, I'm writing in to see if someone can help me with my upload speeds on my SB8200 modem. I am only getting 25 Mbps though my package calls for 100 Mbps. I am only seeing 4 bonded upstream channels and they are all QAM. Not sure if OFDMA has been rolled out in my area, but can confirm the upstream light is green on the modem if that matters to get the full 100 Mbps. I've tried to factory reset to ensure I got the latest firmware and everything, but it still tops out at 25 Mbps upstream. The downstream speeds are just fine. Firmware is AB01.02.053.05_051921_193.0A.NSH. I've reached out to customer support and they say everything looks fine on their end.