True, the short valve-side rocker arm lever, combined with high lift, has a large side-thrust vector at both ends of the curve.
Typically the size of the vector isn't related to the rocker arm ratio, since ratio changes are generally done by adjusting the cam-side lever length.
As the valve-side lever gets longer (392 and 426 exhausts) more of the motion is nearly vertical. An engine I'm researching has a 2.03" long rocker lever and .350" lift, a ratio of 5.8:1. By comparison, a 1.65" lever at .700" lift is 2.4:1.