Will Klipsch Forte IV's Work In A Smaller Room?

Yes

A couple of years ago I made a wood structure that tied my Cornwalls together precisely as to toe-in and distance between the speakers as well as distance to the rear wall. Everything was linked together on a common track so that all variables could be duplicated precisely and in unison by measuring against the back wall with a spring coiled tape measure.

Each speaker was linked to the track at at a hinged back corner which became a pivot point for toe-in. It was then that I gained an appreciation for precise speaker placement without wrangling with tape markers and all the rest of it. If you can adjust speakers accurately without having to fuss with it, then you are more likely to play with variables to your heart’s content and get a feel for what is going on in your room.

My listening room has pine floors to which the apparatus could be attached.

You don’t need high efficiency speakers in that room unless you’re trying to peel the wallpaper.  I have 87db speakers with 6watts of set power in an 11x14 room.  Average listening volumes of 65-70db with peaks in the low 80’s.  Very satisfying for my tastes.