Hi,
long time since this poste, but anyway:
I am using Lynx (previously L2B, now Aurora8) and ASIO for both music and dvd/bluray video. Not had one single audio hiccup when running at a track's native sample rate. I tried once to use the Output format plugin to resample all audio to 96kHz because I use digital room correction and would like to run at same sample rate because I am lazy. No, then hiccups occurred almost every time I e.g. scrolled a web page or other similar "heavy operation". Any possibliity your problem is something in that direction? The Output format plugin as such works fine. I remix most 5.1 audio tracks to 7.1, and that runs smoothly. Only bad experience with resampling.