Presentation is Too Forward, where to start?

My listening position is about 6 - 8 feet from the speaker plane.

do you have an exact measurement of your listening chair from the speaker plane? 6-8' seems to imply that you move the chair around in that 2' region OR you move as your listening session progresses! OR, are you simply ballparking the number; you never measured it?
8' would be better if you could help it.

One question for you: how high are your ears off the floor? Your speaker is only 33.5" tall per the specifications. What I'm wondering is whether or not the drivers have integrated at your listening position? If they haven't, then you are going to hear a lot more treble/high freq & that'll bite your ears. Hence the suggestion to move back to 8' giving the drivers another 2' to integrate. If you cannot move back, change your chair & get one that makes you sit lower so that your ears get closer to the floor. This is another way to get the drivers to integrate. If you are unwilling to sit lower, you can also raise your speaker - you go down OR your speaker goes up: same difference. Yet another way to assist driver integration is to tilt your speaker back a few degrees. I prefer the 1st 2 options & the 3rd only if you've no other choice.
Stereophile did measurements on your speaker model in 2006 but their measurements are at 50" which makes absolutely no sense at all. Who'd be sitting in a chair with one's ears 50" off the floor?? Looking at Fig 6, I was trying to see if their measuring height was correct. If it was the impulse response would have been a triangle rather than a triangle with a starting glitch. Their measurement of 50" is so far above the speaker that it's very hard to guess how much lower you need to sit. In measurements of some other speakers back in time, such as the Thiels, Stereophile used to adjust their measurement height to get a good impulse response (maybe they cared back then & they now have a GFY attitude today? With people paying them sub-$10 per year for their rag, they probably do!). Anyway Stereophile's measurements are essentially useless for home listening.
http://www.stereophile.com/content/monitor-audio-silver-rs6-loudspeaker-measurements

I believe the 50" refers to the distance from the speaker with the measurement taken at the height of the tweeter. From the measurements it would appear that playing with toe-in should reduce the treble balance.

you're right Onhwy61 - I read it wrong! I went back & re-read it & it says "step response on tweeter axis at 50". My bad!

Bombaywalla, Thanks for the input. My listening position starts at 6 feet (triangle theory, I'm 6 feet from the speakers' plane and I then find myself moving back trying to find the sweet spot. I sit in an office chair at the lowest setting and I'm 6'5" so my ears are 47" above the floor or a foot above the top of the speaker cabinets. Looks like I need a bean bag chair. I'll try a listening session on the floor tonight. jwhiii56

It's the speakers.

You are receiving excess high-frequency energy from the side-wall and ceiling reflections due to the broadening polar response above the cross-over and have a few high frequency resonances that will color the sound including the metal mid-range driver breakup which isn't corrected sufficiently and a big 10dB peak at 15KHz which will be quite noticeable if you're young and did not destroy your hearing with ear buds cranked up too loud.

A parametric equalizer could be used to eliminate the resonance's effect on speaker response.

Treating the first reflection points with rigid fiberglass panels might help with the excess energy.