I can only speak for me, but I’d stick with the steel fork. I worry a whole lot less when it’s a steel fork especially when hitting road imperfections during high speed gravity descents. The carbon fork may well withstand the impacts, but if it doesn’t, I’d be eating the pavement at a speed that would not make for a happy ending. Steel forks have always withstood such impacts for me, so I’d stick with the steel fork especially since the weight difference isn’t all the much. For me, a couple extra pounds is inconsequential.