Not sure how heavy the heads are compared to standard weights, but no need to think that just because they are “hybrid” irons that they are heavier. Many hybrid irons have weights that are the same as regular irons. They may be heavier, but I just don’t know for sure. 50 gram shafts could work either way, if they fit you and provide you the feel you want. A 30 gram drop in shaft weight will reduce not only the total weight of the club, but the swing weight (if you make them the same length) by approximately 3-3.5 points. Just something to be aware of.