I have the 6187S and I haven't seen anything like this.
At the AVS forums, bowing is a common complaint.
How old is your set?
If it's severe, you will need a service tech to come look at it.
The "sparkling" might be the rainbow affect of the color wheel.
Does it get worst (or better) if you rapidly move your head from side to side?
The LED engine is supposed to reduce the rainbow effect, and for me it did verses a lamp based set.
Others however have reported the exact opposite.
Everyone's eyes are different so I'm not surprised of this.
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