I personally don't like the "wrap around" method... I find it puts too much stress in my shoulders. As long as your hands are outside of your elbows and the bottom, and your shoulders-elbows-hands form a straight line, your good at the bottom. I prefer to straighten my arms as my hands get closer together at the top to get a good squeeze in my chest. Imagine that you are making a triangle from the level of the bench to a point straight over your chest. The key is to experiment a little and find out what FEELS best for you. Just make sure that the workload is in your chest and not all in your shoulders
just my opinion
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