IMHO, yes, the Forte II (I'm an owner) is going to be a significant step up. I may have heard the '3s long ago at Klipsch and they are good. There were many demoed for us at a Pilgrimage.
My guess is that Klipsch went to the RF series to have a product which is stylishly tall and thin -- and reach price points.
However, in my view, the Forte II must work better because of the greater area of the direct radiator, the big passsive radiator, the large tractrix midrange, and the tweeter. Those items made it expensive to manufacture and, in comparison, not so thin.
I'd suggest you find some Forte II, Quartets, or Chorus II.
Wm McD