Airport Extreme better than TP-LINK Archer C7 AC1750?

in Current Mac Hardware
We have very thick walls and getting/maintaining good wifi connections can be a nightmare. Across 3 floors, we have 1 each mac air, macbook and 2 iPads, 2 apple phones (7 + 6s). Verizon naturally hopeless despite expenditure of arm/leg. After much research, good amazon reviews, installed a TP-LINK Archer C7 AC1750. Disappointing! 

Will I have a better result with Airport Extreme ? or what should I do next?  thanks

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