The problem is that Hair Collision is randomly ignored ,even in the latest Service Release.

I'm not sure that is fixable. It's a resource issue, I'm pretty sure. If you use really low-res hair, and a really low-res collision object, collision works perfectly. High res, and it works imperfectly or not at all. V3 is way too high res to work well, and probably even Judy is, depending on your machine. I suspect we won't get really good, high-res dynamic hair until there's a big improvement in hardware. Or maybe network rendering.