My 1.5mm chest/back longsleave rashie just doesn't keep me warm in the summer around mid-Atlantic in July/August. Dawn patrol sessions and I'm shivering. Should I go for a 3/2 shorty or what would be the best option? I've been able to get a really extended annual timeperiod out of my 4/3...I'm worn it up to 68 degree water temp and was comfortable (not hot) and also worn it as low as 48 degree water temp (with hood, boots glove) and was actually warmer than my summer surfing in my 1.5mm rashie mentioned above. So for OCMD/Del areas for summertime would 3/2 shorty be best option to buy?