Orbi v2.0.74 VLAN tagging thoroughput slow

I've updated to v2.0.74 and now the network barely runs at anything about 30-100Mbps. I'm on a 1000/100Mbps connection, tried wirelessly and wired and I'm not getting the speeds I used to (1000Mbps wired, 400Mbps wireless) get pre-update. I've verified it's not an issue with the ISP and have disconnected the router and modem to another router and thoroughput is significantly higher than the Orbi. Anyone know a fix? My ISP requires VLAN tagging for a connection, so there's way around this unfortunately - I've seen a few people with tickets on this issue but no resolution yet.