How do you match them for the best results?

There isn't. All you can do is cross your fingers. :D

I took a chance and have a couple foals from two W stallions. 1 out of my Elites Mare the other out f my premium. Hoping for something good.

I breed for bravery and regular ratings. So I'm ending up looking to match traits with stallions with at least PPP ratings, and as strong a rating as possible. I have gone with as low as Superb bravery on occasion, but I really try to get at least Premium bravery.

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I would strongly recommend breeding at least Premium bravery if possible. Elite bravery seems to fare a bit better results in foals than Premium bravery, but that may be subject to each individual mare. When I bred several Superb bravery mares, the foals tend to be either Superb or Average bravery, even though their sires (the stallions) often had stronger bravery than the mares.

Personilly I only breed my WC horses and sell all the others.

When I did do bravery (about a month ago before selling my stock) I only kept World Class mares from top 10 BABLB studs, then bred them to top 10 BABLB studs for the best results. I also made sure that the mares maternal side also had strong LB lines. About 80% of the time I got a World-Class foal.