I ate kosher most of my life until recently, so I've done a LOT of beef back ribs. My go to is light mustard to wet, a Mephis Rub (yes, I'm serious). I know some might think the sweetness is a bad move... but from someone who never ate pork ribs, it was great to have a sweet sticky bbq meat!
From amazingribs.com of course...
https://amazingribs.com/tested-recipes/spice-rubs-and-pastes/meatheads-memphis-dust-rub-recipe
Into the Traeger on smoke for 2 hours, then up to 250 degrees. I mix 50/50 worchestshire and apple cider vinegar plus some of the rub and mop the ribs every 30 minutes after the first hour (or when the outside starts looking dry and crackly) until we hit about 195, then I start probing. Usually come out right before 200.
I've done this a lot of times and my SO and I think this really produces the best texture of meat. Not stewy at all, not dry at all... perfect honeycomb meat texture. It has bite but melts in your mouth.
I do the same thing with extended timeframes for my short ribs, if I'm making this particular style... but short ribs are great so many ways when the texture is right.
Lot's of weird thoughts on Kosher in this thread btw. If the guy says he'll eat some beef ribs he'll eat some beef ribs. We never worried about mixing meat and dairy or having different sets and all that. Yes... I know the Rabbis and companies making billions on this industry insist you must, and that they have to bless it specially, blablabla.
Anyone who claims to know exact rules around Kosher is either trying to make a buck or just making stuff up. There is WIDE disagreement amongst Jewish scholars as to how certain rules should be interpreted, and this is of course reflected in the diets of people keeping kosher all over the world.