Filter with Return: Cure for Vaporlock?

Just wondering if I add a filter with return to tank will alleviate some slight pinging after car is fully warm after driving it for about 30 minutes in hot 97° f weather in Texas. Within 1st 30 minutes it runs flawlessly if I get on it. But after that it feels less powerful and slightly sluggish. Also I think the open chrome airfilter is another problem. I also need to introduce cold air to let engine breathe outside air not hot engine air. Please give me ideas.