I'm thinking of making a pair of skew rebate planes for the woodie build-off. Looking around on the web I find the skew angles vastly different on these planes. For example Terry Gordon's is skewed at 4*, while the Veritas skew-block is 15* and the Veritas Skew Rabbet is skewed at 30*. Quite a difference. I'm wondering, in terms of usage, what difference these angles make. Thanks.