Can you clarify how the E.Loft vs FA is calculated for the ST190?
@60.25 lie, a 1.5dg open face angle would result in a 1.5x[tan(90°-60.25°)] = 0.857 > 8.643 degrees of loft rather than 8.375.
In order to get to a 1:0.75 ratio as indicated, lie would have to be (fixed) around 53dg. Or maybe the FA measurement is around a different axis?
Disregarding lie angle altogether and 'just' squaring the face would result in a 1:1 ratio.
Just wondering; Titleist seems to use a similar FA/E/loft ratio but others don't.