OP updated again, with new chart showing that ATP Players near the optimum MgR/I range and effective mass > 160g have superior rankings.
Effective mass of 16g (calculated 12cm from tip) corresponds to around 350 swingweight for a standard length midplus racquet.
BLX Blade 98. 13.58 oz., 12.55", 366 SW. 16x20 (outer mains skipped)
Pre-Stretched Ashaway Kevlar 18g/ZX Monogut Natural 16g, 66/46 lbs