Nice job Zippy, and well deserving of a like.
Picanha (Coulette, top sirloin cap, rump cap/cover, etc.) is a wonderful piece of beef provided you can find a butcher who can properly cut it, which isn't easy in much of the U.S. Even when you can find a knowledgeable butcher U.S. familiar with the cut, many want to heavily trim, or even remove the fat cap which is a no-no. It's meant to be cooked and served with the fat cap. Looks like you found a good source and know what you're doing. Great work!
Like your cooker, also.