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Application of in-plane uniaxial stress to the quasi-2D correlated material Sr₂RuO₄ results in pronounced changes to the physical properties; most widely recognized is a factor 2.5 increase in superconducting transition temperature. The normal state is also significantly impacted. Reported here are ¹⁷O NMR hyperfine shifts over a wide range of stress, field, and temperature. Results are compared to renormalized 3-band Wannier models constructed from DFT calculations. The crossover temperature to standard Fermi Liquid properties is observed to be tuned continuously from T_FL=30 K to 0 K with applied stress. Furthermore, the combination of correlations and the stress-controlled proximity of E_F to a van Hove singularity are the main factors in determining the normal state properties for temperatures of order 300 K and below.