I am strictly a rec diver ....
Ditto with me for the greatest majority of my dives - I don't have much - a simple plate, basic webbing, for single tank diving I use a DiveRite transpack 30# wing. With a steel 72 and up to 3mm of Neoprene I use no lead at all. It's as simple as it gets. The plate was made by FredT who I also bought all the hardware sans wing. I put it together in about 20 minutes in my living room and was amazed at how easy it worked out.