Yesterday, I replaced a FIOS Quantum router with an Archer AX6000.  My 5GHz wireless speeds have dropped from about 400Mbps up/down to about 300down/200up.  I have FIOS Gigabit internet and am measuring speeds with the Speettest app on my iPhone XR.  I expected speeds to be at least the same with the new router and when I get an AX device, I would hope those speeds would be even higher. 

Anyone else have experience replacing a Quantum router with an AX6000?  I feel like returning this router, because I basically wasted $300 to get lower speeds.