I've never seen a dug in brace in our country. The PFRA is starting to let contractors just drive in big posts instead of digging in a deadman.We must have different soil because the braces I built in the early 80's still solid-a pounded post is always more solid than a tamped in one I'd think. Steel would be good but they tend to be tough on electric fence seems like they always find a way to arc out. My one pet peeve anywhere is pounding big treated posts for bracing then using something untreated for the cross piece. Now if I could get over my congentital defect of not being able to keep things in a straight line.