Coming right along. Good.
I want you to start moving your main speakers around, front to back, side to side, while also measuring them just the way you have. Try to see if you can make it look smoother. Do what you can to move them, but without compromising imaging or staging
. If you can't move them much and the measurement above is what we have to work with, fine.
No big deal. But a few inches here and there can make marked differences.
After you have done that, then place the Tritraps in the front corners or 244's (if you don't have the Tritraps) and post those measurements.
Don't despair, I'm not the least bit surprised by your peaks and valleys from 40 Hz to 150 hz as this is the modal region which will look like that in all rooms that are untreated or do not have multiple sub implementation. The area from 100-300hz will also
be highly influenced by the distance of your mains to the side walls, front wall, ceiling and floor - it is called SBIR or the Allison effect. Read about it here: http://arqen.com/acoustics-101/speaker-placement-boundary-interference/
100-300 Hz is difficult
to get right. It will require room treatment (those Tritraps, 244's, etc...), proper loudspeaker positioning (as mentioned above), sometimes
EQ and rarely
broadband subs or mid bass modules can help, but that is extraordinarily tricky to implement without risking localization.
Calculate all the room modes for your room here, use approximate dimensions since your room dimensions are a little quirky: http://amroc.andymel.eu
as it is educational and may not apply to your room since yours is not perfectly rectangular. Read this for more on that subject: http://www.acousticfrontiers.com/room-modes-101/
Best of luck,