Normally some frames are dropped or have presentation glitches during seaking and startup, is this what you are seeing or do you get them during normal playback?
Queue sizes are a trade-off between responsiveness and stability, I tend to go for smaller queues like 12 CPU, 6 GPU and only 3 frames presented in advance for max responsiveness. My system is still very stable during playback, with no dropped frames or presentation glitches, but I do get a few frame drops and glitches on startup or when seaking.
I have noticed that Windowed Overlay is a little more stable than other modes, remember exclusive overwrites overlay.
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