I think it's best not to fuck around with your DIN and ride with them at the recommended settings, but if you're still releasing at recommended and the forward pressure is set properly, you can always increase the DIN setting if you choose to (A little at a time of course). If you're currently riding with a lower than recommended DIN but are not pre-releasing (and the forward pressure is set right) then there is no reason why you shouldn't leave them like that if you're happy. Although, pre-release can be just as dangerous as not releasing, and just because it hasn't happened doesn't mean that it won't. Long story short, get them adjusted buy a qualified technician and then don't touch them, especially if you're a 'binding noob' as you put it.
I prefer the pivot design over any other binding, and it shouldn't matter what you're going to mount them on, as long as the brakes are wide enough to fit over the ski. If the brakes are slightly too small they can be bent a bit to fit, but again get it done at the shop. Do you know where you want to mount them? If not check out:
Hope that helps