Synthetic oil is a lot slipperier than dino oil; it's not unheard of to see a gain of ~1-2% in power on the dyno switching to synthetic do to reduced friction.
As to how it feels/sounds as you approach the red, my guess is that after 6.5K the motor is beginning to gradually lose torque, and without different heads/cams or a different VVEL tune, that's just the way it is.
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