Vented vinyl or OSB Soffits and related questions

I have existing soffits that appear to be made out of Masonite or similar clap board type material, with a continuous aluminum vent strip. The soffit on a portion over my garage has pulled away, so needs to be replaced. I am considering installing vented vinyl soffits (will also have a ridge vent installed to work in conjunction with the soffit vents). I have read that OSB soffits withstand high winds much better than vinyl. I want to avoid potential soffit blow-offs and consequent wind-driven rain in the attic. My questions are: (1) if the soffit material is in good shape elsewhere, should I leave it for any protection it provides, and install the vented vinyl soffit on the bottom side of it? Or (2) should I tear it all out and just install the vinyl soffit (less than 12-inch wide) to a horizontal nailer at the wall and then to the fascia board, and (3) should the aluminum vent in the existing soffit be removed first before installing the new vinyl soffit, to improve ventilation/air flow to the attic, or would that let bugs and/or wind-driven rain in? (4) Or should I drill holes between the joists in the existing soffit to increase ventilation if/as needed. And (5) Is it advisable to put a wire mesh or screen above the vented soffit to help keep bugs out? And (6), is there any kind of a baffle or diverter that is/could be used in conjunction with the soffit vents to reduce any potential wind-driven rain from being driven or sucked into the attic (without unduly disrupting the proper air flow)? I am new to all this, and appreciate your help!

Vented vinyl or OSB Soffits and related questions