@soulcat Congrats! Your Heresys were made in 1984 and are Walnut Oil finished. Lots of people use Watco Rejuvenating Oil on Klipsch speakers with an oil finish.
More than likely yours are the Heresy “1.5” version which uses the midrange driver from the Heresy II. It was kind of a transitional model.
As far as I know, the only factory riser offered for the Heresy is a slanted riser that tilts them up in front to aim the speaker up a little. Any factory riser is easily removed with four screws accessed from the bottom.
I would just listen and enjoy them before you start any crossover work. One thing I would suggest and that I’ve done with all my vintage Klipsch is to remove the cabinet backs, locate the crossover and loosen and tighten all the screws on it. This will remove years of oxidation and give a better signal path to everything.
I think some people see a Heresy and its 12” woofer and think man these things should pound out the bass! These are usually people who have had cheap speakers with big woofers and are used to bloated, overemphasized bass.