It sounds like you are doing a really good job of taking care of your heart! Don't let yourself feel doomed by your family history - it's only a portion of your risk profile. It does mean you need to be extra vigilant, but you CAN take charge of the situation.
My suggestion would be to get yourself an advanced lipid profile test, such as a VAP test. This will really give you a lot of information about your heart health, and may help pinpoint what sort of risk factor, if any, you may have inherited. Depending on what is discovered, you can fine tune both your diet and medication/supplements to give you the best results, tailored to your particular characteristics.
And it might serve to reassure you that things don't look so bleak!
Btw, when I had my recent cardiac evaluation, the cardiologist was only interested in first degree relatives - I could have had your exact family history and it would never have come up! But I think you're wise to be extra careful of course - I'd just hate to see it become a source of great worry, because you're probably a very healthy person
Kudos to you for taking such good care of yourself, and let us know where you decide to go from here.