how to set rx and tx fifo sizes

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Can anyone tell me how to change the rx and tx fifo sizes for a USB virtual serial port? We're trying to run at high effective baud rates (would like to utilize the full 12mbps of our USB 1.1 device), and servicing a read routine at 16Hz. Initial investigations reveal what looks like a buffer size of PAGE_SIZE (but we may have looked in the wrong area), or 4K. We can't easily service the read routine faster than 16Hz, which if our math is right, that means we'll average 7500 byte reads if we utilize 100% of the throughput. On the host side, we're using the cdc_acm driver, and on the device side (if it matters at all), we're using LPCUSB.
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