help with OPI board selection for USB intensive application

Chourizo

I am working on a camera array, ie, recording 3 cameras in 1080p (h264 encoded, usb 2.0) to a usb stick. I am using my own software (based on v4l2) and it requires almost no processing, the processor is always under 10%.

After trying multiple linux boards (odroid, rpi...) the only board that allows me to do that are the Allwinner based ones, because of the 4 independent USBs.
I am able to it with the orange pi zero, more or less ok. If I push the cameras to the limit, 1080p@30 fps I see a little bit of video noise when there is a lot of movement (movement increases the size of the video, and the bandwidth through the USB). I'd like to fix that.
So two questions:

1. Is there anything that I can do to improve the speed of the USB transfers via software?
2. My current OPIZ is the H2+. Would it be any better with a board based on the H5 for this application?