OP, might I suggest a class? Not a typical basic riders course, but an adv type, even a motocross perhaps. I don't think you're in the wrong at all for approaching downhills with more caution than an uphill. Especially those spooky steep ones where you look down your forktubes at them before diving in. Things can go real wrong, real fast on those. If you've got an area to practice on, I'd also suggest doing it there. Not on a series of downhills, or a long ride covering different ones, but a single track spot where you can practice technique over and over again without distraction and additional variables. And coaching if you can get it. Having a skilled rider watching you and giving you feedback on what they see can be tremedously helpfull. And, no matter what, a genuinely steep downhill is a demanding ride. There is *nothing* wrong with approaching it with caution, or with feeling less than bullet proof with the increased snow up on the mountain peak.