Orbi RBK753S Upload speed

I just got the RBK753S system.  I'm on Verizon Fios with 1gb down/up speed.  With my new Orbi router, I am getting over 900 down and 900 up when tested at the router.  But when I test on my iPhone 11 Pro, I'm getting 500-600 down and only around 40 up.  (For reference,  my old router (Verizon quantum gateway) gave me 400 down and 400 up when also tested on my iPhone.)  

I'm not that concerned about the drop from 900 down (on router) to 500-600 down (on device), but the drop on the up speed as between router and device makes me think sometthing is configured incorrectly - especially since I was able to get much better upload speeds with my fios router.  Anyone know which settings to check?  I'm on the latest firmware.  I've toggled 20/40 MHz Coexistence based on some other forum posts, but that didn't seem to do anything.  Changing wifi channels didn't seem to do anything either.

Thanks in advance.