I've just invested in a new pair of waders/boots and the boots come with felt soles. All my previous waders have had rubber soles with studs and have performed very well. For slippy, weedy rocks (sea) and grassy banks (river) would it be best to attach studs or not? I've got some of the Simms screw-in studs but not sure whether i should use them or not. Any advice would be appreciated.