I've tried to make the switch to midfoot striking, but honestly, it's not something I worry about too much. If you're comfortable with your current form, I don't think it's worth stressing about. I've seen guys with terrible form crush it on the roads, and guys with perfect form struggle to finish a 5K. It's all about what works for you. That being said, if you're experiencing injuries, maybe it's worth taking a closer look at your form. But if you're running pain-free, don't sweat it.
Trail Runner Nation is a great choice. I've listened to it too and found it really informative. If you're looking for more options, I'd recommend 'The Running Coach' podcast. It's more focused on training and racing, and the host has a no-BS approach that I appreciate. Worth checking out.