On my RV, I started using the cheap, non-adjustable water pressure regulator. When I changed to an adjustable pressure regulator, I set the PSI at 45 and flow improved in the RV. They run about $50 at RV stores. Next thing to check is your water filter. Some can restrict flow quite a bit. I use a water filter designed for home use and not for an RV -- gives me more gallons/minute. Final thing to check is for sand or obstructions in your lines. You have a filter at your toilet and most likely each faucet has a screen too that can clog if you've had hard water or sand build up.
My opinion is the size of your water lines is not the problem.
Good luck!
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F-350 Dually
Cedar Creek Silverback
Mazda Miata TOAD for sex appeal
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