Wow, congrats on your a1c numbers. That is great. Mine is always right around mid 6 to 7.
I take a low dose Lisinopril every morning since there has been research done on its kidney protective effects. Type 1 diabetics, even those with good blood glucose control, are at HIGH risk for nephropathy (kidney damage). If you never suffer any spikes in your blood glucose, then taking this medication probably will not do you any good. However, if you are like me and you have the occasional, unavoidable spike for unknown reasons, it's probably a good idea to be taking the medication.
Good news is, it's extremely cheap. I'm getting my degree in nutrition so I see where you're coming from. I just consider it as an active food substance that has been concentrated. It's at such a low dose that I never feel any side effects; no dizziness, no cough, no feeling faint. I highly recommend taking it.