Can a change of grip make a difference to your golf

While there is no one right way to grip a club there is a right way for you and finding it can help drastically.

Your grip is largely responsible for the position of you club right throughout your swing including the important part - impact. It is therefore very likely that your grip is a major contributor to your recent success.

What I will say is if you're shooting 75s with it, stick with it even when you hit a bad patch as it clearly works for you.