Huh, did I write this under another name? Like Derek, I also have a #4 LV custom with a 42 deg. frog. I blame Derek for doing all the work that influenced me to buy the plane set up that way. Love it, love it, love it. I also like a smaller plane and wish that LV made a #3. So (unaware that Derek had trod the same path) I purchased a LN bronze #3 with the 55 deg. frog. I don't love it. Hard to push, Not sure I get anything out of the higher frog with a close set cap iron. I do, however, love the size and see a new frog purchase in my future.
I also set up my BU jack with a higher angle, although my BU jointer is a 45 deg. angle.
Jeff.