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how can I alter my approach to hook the girls in conversation for a minute or two so my game has a chance to set in.
If your problem is fixing the way you approach someone, the ONLY way to do it, is trying to fix it every time you approach someone until you overwrite your old "approaching habit". There is no simpler way to do it.
Generally, a girl calls "nice guy" a guy who don't look like he has sexual interest for the girl (or for anyone, a classic white knight beta male). So my tip would be: Try being more man to woman. Give little teases and keep with the conversation. Intensifying and releasing sexual pressure in the conversation.