Once you open the pool, you can confirm the filter pressure but with what you have told me and a target of around 17 PSI, here is what I get from the hydraulics model:
Current setup
75 GPM @ 54' head, 1800 watts, 2.52 Gallons/watt-hr
Changing only the pad plumbing to 2"
87 GPM @ 45' head, 1920 watts, 2.71 Gallons/watt-hr
Changing all plumbing to 2"
90 GPM @ 43' head, 1960 watts, 2.76 Gallons/watt-hr
Gallons/watt-hr is the primary metric I use for efficiency so changing the pad plumbing gives you about 7.5% more efficiency. Replacing the suction and return lines only about 2% more. But this assumes that all of the fittings and valves are changed with the pipe.
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