Ping spikes Orbi Satellite RBS50

I agree. You have done a good job documenting the problem  1/2 second for a simple ping within the Orbi network is too long.

The "Daisy Chain" of two WiFi backhaul connections may be a factor. (hot 1:router to satellite 1, hop2: satellite 1 to satellite 2)

Some possibilities come to mind:

1. Remove the "Daisy Chain".(uncheck the option on the Orbi web interface, Advanced Tab, Advanced Setup, Wireless Settings (toward the bottom) uncheck Allow Daisy Chain.
   This will only work if satellite 2 is able to get a "Good" connection directly to the Orbi router.
   Unchecking the box does not cause an immediate change. (Computers are fast, but sometimes they are very slow.)
   May have to power the satellites off and back on and wait for them to settle.  The "proof" will be on the Orbi Attached Devices page showing both satellites connected to the router.
   If satellite 2 turns magenta and reports a "Poor" connection, then this is not going to work.
   But, if satellite 2 gets a "Good" connection, maybe the performance will be satisfactory.
2. Replace the WiFi backhaul with ethernet.
   Ideally, directly between the router and satellite 1 and the router and satellite 2.
   If that can't be done, then from router to satellite 1 and then satellite 1 to satellite 2.
   I keep several long ethernet cables in my "box of computer stuff" to test things such as this.  Amazon sells Cat5e 50ft and 100ft ethernet cables for under $20.
   I would run cables temporarily (down the hall, up the stairs, etc.) to test it out.
   If the result is a dramatic improvement, then it is time to address the cost/benefit issue.
   Is improved gaming experience worth the hassle of running ethernet cables through the attic, through the crawl space, down the side of the house (or wherever)?  Only you can answer decide.