Slow speeds on RBR760

Hello, I’m in Canada, and have a shaw gen 2 XB7 wifi modem set up in the basement. Previously, I connected my ps5 (located 1 floor directly above) to this through 5 ghz wifi. This was giving me about 400 mb/s on playstation 5 speed test. The problem was the signal strength through the rest of the house was sometimes poor for phones, and occasionally I’d get some lag while gaming.

I went out and got an orbi rbr760 tri band mesh network with 2 satellites. So now the main router is wired to the shaw modem downstairs, and I placed 1 of the satellites right next to my ps5 upstairs and ran cat 5e between them. I figured this would be the same thing as before for ps5 (as the mesh is still wifi), with maybe a more stable connection due to the better antenna on the mesh setup vs the ps5, all while providing better coverage around the house.

I was expecting maybe a slight drop in speeds, but when I ran a speed test on ps5 I was only getting 70 mb/s through the orbi compared to the 400 from before just using wifi to the modem. Is there some setup/changes I need to make with the orbi settings potentially, or is this just standard for mesh setups?

I do have a coax outlet a couple rooms away I’ve already ran to the room with ps5 for cable tv, I heard that moca adaptors are good, is this option a lot better?

Thanks