I have the LC 4" and their Big plate before they stopped selling them. You will have no issue with the LC Backing Plate system. They are top notch quality. As for the Lake Country larger backing plate....I have not used it or have no intentions of using it. I do not need 7.5" Pads. The 6.5" and 5" Hybrid pads is all you will ever need for that machine.
You have an awesome machine in the Flex.
As for you PC you can delegate that with a smaller pad for the small or areas that you think the Flex is too big. I did with my PC7424XP. I have set it up with the 3-4" Pads for correcting and applying sealant/waxes. This way you cover all areas of correcting.
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