If you go tech eventually, you'll probably have to get some larger wings. My Dive Rite wings are 70 # of lift. I have OMS wings also that are about 60# of lift. Those steel cylinders are very negative. In a drysuit with very thick undergarments, I need no extra weight. In fact my first time diving doubles, I foolishly let ll the air out. I was drug down to 95 ft at the quarry in less than a minute. Needless to say it scared the beegeebers out of me. It was Brain Tierney (the one who went with you on your drysuit dive) who got me to dive deep with the twin cylinders again. It was an excellent dive. It was a big boost to my confidence.