I disagree with those telling you it will be fine. It does depend on your body makeup and exposure suit but a generic statement that it will be fine is simply not true. In cold water where you are wearing a good bit of exposure suit that might be reasonable but for warm tropic water, a SS plate will likely overweight you by a fair amount. In warm fresh water I dive with no weights at all, a BC (or BP) that is near neutral and an al 80 tank . A SS plate would overweight me by almost 6 lbs, a totally unacceptable amount of overweighting. For warm tropical salt water, I dive 4 lbs, again a SS plate would overweight me by 2 lbs with no additional weight and this assumes no STA, not to mention you have to carry that extra weight when you travel. I am a little fluffier than you are so your weighting requirements should be less than mine. You can always add lead if you need more but if your basic rig is more negative than you need, you are stuck being overweighted.