For first stages I have Conshelf XIV (non sealed) or Sherwood Brut with dry bleed. I don’t plan on ice diving but the quarry water temperature is around 40 F. I have metal Conshelf second stages. Do I need to look elsewhere for a first stage that can work in this water or is what I have good enough? I’m already set with drysuit and undergarments, but overlooked this bit for local Michigan/Ohio diving.