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I did this too. Sweats have a lot a loft. They require more lead than you would think to sink them. I made the same mistake and mysteriously found myself quite underweighted with an additional four pounds already on me from when I did my dives for my drysuit cert in AOW. If you do anything, get thicker undies and lighter clothes on under the undersuit (like a real thin running suit). You will be suprised at how much weight you won't be using and you won't be that much colder.s7595:mjh
I agree with your calcuations
I weigh 165lbs ,yet when I put sweat pants and sweat top over t-shirt , dry suit underware . then vent suit with 28lbs could not get down had to pull on ascent then could not stay down .
when added extra weight no problem to get down and stay down
hope it changes soon