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OK, you have a quasi parametric instead of a true parametric. The width of frequencies effected on both the left and right of the center frequency is known as the Q. A wide Q would effect a lot of frequencies near it and a narrow Q would only focus on the few right at the center frequency. Yours must a have a fixed Q. A 45* angle means nothing. There should be some info on your model about what the Q is. Maybe there is an online manual for it.
Did you check the x-over freqs? Does your system sound weak in the midbass area?
Also, what source material are you using to measure those earlier responses?
If you don't think your x-overs need any tweaking, then try this.
Band 1 to 50hz and cut it 3 dB.
Band 2 to 125 and raise it 4 dB.
Band 3 to 250 and raise it 3 dB.
Band 4 to 500hz and raise it 4 dB.
Band 5 leave it flat.
Band 6 leave it flat.
Band 7 to 3.5kHz and raise it 3 - 4 dB.
Band 8 to 8kHz and raise it maybe 4 - 5 dB
Band 9 to 14kHz and raise it around 7 - 8 dB
Bands 8 and 9 are mainly the tweeter so depending on where they are mounted and aimed you may need to add more or less. Sometimes the SPL meters don't pick them up too well if your tweets are very directional. So just play with the levels on bands 8 and 9 so that you can hear the highs,but you don't want them to sound tinny or harsh or too overbearing. You don't really need good reponse out to 20kHz, 16kHz is more realistic for actual listening so if the response rolls off on the very top it's no big deal. We can move the center freq of band 7 closer to 5kHz if you think the sound should have more bite or sharpness to it, otherwise the 3.5kHz center freq should sound a bit more mellow.
Crank up the volume and see how it sounds. Do you have any high end recordings from Telarc, Sheffield or anything known to be accurate and have good tonal response without being compressed? That's what you need to listen to to check the tonal balance. Voices in particular need to sound realistic like they are from a real person standing nearby.
What kind of music are you going to be listening to most of the time?
If it sounds better, then plot out the response again using your SPL meter and we'll see what the adjustments did. We'll look to see if the dips and the peaks are better or still there.
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