Klipsch Forte ii too bright, or is it my room ?

I recently got a pair of Cornwall IV's and the first thing I did was follow the mods that are posted.  The horns have a plastic housing that I dampened with dynamat and I also braced up the cabinets.  Nice change and took some of the harshness out of the speakers.  Do it.  It works.  Then you need to soften your room up.  And last...let the Pioneer rest in peace.
I had a Carver Crimson 275 laying around and I popped in some NOS signal tubes and fronted it with a Don Sachs pre and DAMN!  The Cornwalls really sing!  I completed the Klipsh mod by changing out the cheap caps in the crossover and easily heard everything smooth out.  Tge Fortes are nice but the horns in the Klipsh horns all have plastic housings that definitely resonate.  The Cornwalls are crazy good with some simple mods and tube amps.

I have the original fortes.  Amp is fisher x202b restored…l replaced the original crossover with alk crossovers (not of klipsch design) and upgraded the tweeter horns with Crites diaphragms….much improved…

Go with a tube amp and the noted upgrades and you will not be disappointed

Not familiar with the Fortes but back in the eighties had a pair of La Scalas. Happy when I bought them, happier still when I sold them. Sorry, just not my cup of tea and this was when matched with the original Mac 275 and/or Marantz 2´s ( these I regret selling to the day). 
Your room is definitely adding to exasperating the brightness but the speakers character  is what it is.

Klipsch sound better with tubes more than ss, and I have owned Khorns, LaScalas, Hersey II's, etc. One thing about Klipsch, people either love them or hate them, there is no in the middle. 

I like vintage audio. See my pics. 

I have Klipsch Chorus IIs, which are similar to yours. I found that a Pioneer SX-1050 was one of the worst matches, and it had been completely restored.  I sold it.  Too bright, and listening fatigue after < 30 minutes.

Sansui (60/70's) is an incredible match, as is quicksilver tube gear.  I like Marantz, but prefer Sansui.  With regards to gear made this decade, I tried Cambridge audio and thought it too was a poor match. Pass Labs is incredible (I built the 8WPC Amp Camp Amp, which is more than enough for your 80db).  As far as restorations, I'm in the boat of replacing all electrolytics, known noisy or problematic transistors/diodes and updated small electrolytics with film caps.  But others don't like to change anything that isn't broke.  When it comes to 45-50 year old E-caps....those folks aren't getting all the highs.