May I ask what Gen MBP?
is it 2x2 5Ghz or 3x3 5Ghz..
Either way I'm sure the issues being seen with WiFi performance on HH5 will be 2.4Ghz... just like every most other ISP router complaints.
Also with most devices even though compatible ending up on 2.4Ghz due to range limits of 5Ghz and most having routers setup with same SSID on both bands