When I started golf this is what I played. Until I got a better understanding of the physics it was difficult to fix as I always went to swing path. Trying all the wrong things.
A ball starting straight indicates you have a straight swing path. Don't F' with your swing path, that was the frustrating part. The fade is being caused by the clubface being open at impact. Work on releasing your forearms and wrists through impact.
The tips I got that worked were the following. Imagine after your swing you want you left palm facing the sky as though to catch raindrops. Or put the tip of a credit card in between the V formed by your left thumb and fore finger (right handed) On set up you will see one side of the card, and the other on follow through.
You should be hitting nice low duck hooks in no time, never being able to hit a nice fade, wondering why you ever tried to lose your fade in the first place.
Actually the duck hooks will probably take years of abuse in just trusting your swing. If these tips don't work at least know if you tee on the right of the tee box and aim down the left of the fairway you will hit alot a fairways with your current shot. More than I likely now hit with a draw. There is a reason Jack Nicklaus used a fade, and alot of good pros are going to a primary fade. Much easier to control