I have a similar situation. I found a used 3mm ScubaPro wetsuit on Ebay. I'm a Great Lakes diver and spend my money on brand new suits for the colder water up here. I have a dive trip to Playa Del Carmen / Cozumel next month and am looking for a 3mm. All my suits are "Large Shorts" The suit on Ebay is a Large. (ScubaPro size charts list Large/Shorts to fit between 5' 9"-5' 11" with the Large being 5' 11" - 6' 1") All size dimensions fit me except the height. I'm about 5' 7", 175 lbs 42 inch chest, 34 inch waist. Will the extra length cause a problem or should I keep shopping? I really like the suit I found and the price is right.
I'm a LS and the Scubapro Large does not fit me. I've tried their 3mm and 5mm and neither fits. (In fact their LS does not work for me either. It's tight in the chest and back). now use only Henderson LS suits. I have the same sizing as you and the additional length in a Large in both legs AND sleeves is the issue. I'm a 32-33 sleeve.