You are VERY wrong here, Yoyo. It's a mistake people FREQUENTLY make and it drives me bonkers. If you are weighted right (not always an easy option in tech), you should only EVER have to swim up the compression of your suit plus the weight of unbreathed gas in your tank. The amount of lead you wear is inconsequential. If you are weighted right, you would be neutral with an empty (or nearly empty) wing and drysuit at 15ft for your safety stop. You will NOT be 28lbs negative. You shouldn't be 28lbs negative at depth in a thick wetsuit that has compressed aggressively.
I dive very negative at the beginning of dives because I'm carrying quite a bit of gas on my and I'm diving heavy tanks. Your AL80 has about 5lbs of gas in it, and your suit wouldn't lose a ton. I'm carrying 30lbs of gas on many of my dives. I'm not including weights of tanks, or weights of my stainless fin straps or weight of my GoPro. You needn't be including the amount of lead you carry because you're not taking into account how much floaty crap you're carrying. My guess? About 20lbs of floaty crap if you're weighted right.