Thank you both. Super helpful. So after much reading, the only questions left are these, some of which were hit on a bit, but not specifically:
1) I have 2" plumbing on the main lines, and 1.75" on my booster pump line. With a DE6020 Hayward filter, if the VS 2.2hp pump was running at full speed, do I have any concerns I could overload the GPM flow rate of the filter and it's DE media filter grids? I couldn't find max flow rate of the 2.2hp/impeller unless I just missed it. Just want to make sure if the pump was running wide open, all will still be ok? Just trying to understand any risks I need to be aware of.
2) On the diffuser,
@racingiron mentioned it would be ok, but I wanted to confirm that online looking at the parts. The SPX3200B3 diffuser has a range of 0.75-3hp correct as far as I can see, I just don't know 100% that is what is in my pump, but I'd imagine it must be as the pump/motor came as a unit when new, so all good there most likely. When I open it all up, will there be a part number stamp or something so I can confirm?
3) I have a Hayward AquaPlus PL-PLUS automation system on my saltwater pool, and just want to be sure I can fully control the VS motor with the system for the pool heater and booster pump (assuming they both require a higher RPM for higher flow) so I don't have to manually control speed when the heater or booster pump turn on. I was given a screenshot saying the motor could work with the Hayward ProLogic, but it doesn't specifically say Aqua Plus. In the install manual, there are references to "Pro Logic" though, and online it seems they are one in the same. This is what's in the Aqua Plus Manual regarding Hayward VSPs:
Hayward Variable Speed Pump: Proper installation of a Hayward Variable Speed Pump (VSP) includes high voltage input wiring, low voltage communication wiring, and menu configuration/settings. The Aqua Plus can control up to 2 Hayward TriStar VSPs and 4 EcoStar VSPs. Refer to the diagram below for proper input wiring to the VSP. Wiring from the 220V breaker must connect through the Aqua Plus’s Filter/Lights/Aux relay. Refer to VSP Address Setting on page 16 to determine which relays can be used with your pump. The selected relay will supply input power to the VSP pump control and be on when the output is on. When the output is off, the relay will be off. Note that when the relay is off (power off to the VSP), the Aqua Plus will not display errors or diagnostics for the pump. The relay must be on for diagnostic function. Refer to the VSP manual(s) for detailed wiring information.
@InyoRich, this is the kit I am going to order, assuming the above 3 questions aren't an issue:
Hayward TriStar VS Motor Upgrade Kit - 2.2HP
www.inyopools.com
Thank you all, hopefully the detail in this thread answers some questions others may have as they look to do the same thing.