JDK, 1/8" is fine. That, along with exposing more barrel and ramrod, will assure you a slim profile.
As far as staples..... maybe not. I like them myself, but you figure it out, even using a 1/16 pin, you're probably already over your 1/8'. At the same time, many contemporary and original guns, have underlugs breaking through into the RR channel/barrel channel.
Recently, I've been using the shallow, slotted dovetail lugs. The dovetail is shallow, and you can file down the profile, and they are already slotted. Adjust the fit with a few taps from a hammer.