Breh keep me posted I'm trying to step up my grill game as well. Can you add a little more information like the process/steps and times?
When I do mine on in the crock, there are many different ways, Honestly you can slather them in sweet baby rays and cook on high 4-6 hrs or low 8-10 and youd have edible ribs. I did mine comp style, i basically did the same shyt with a crock and broiler id do with a smoker and a grill.
Im stilll thinking of recording me making up the second rack in my freezer.
I lubed up my ribs, put my seasoning on, then set them in the fridge for 5 hrs because I had to go to work, came home on my break threw them in the pot set the time for 10hrs on low, came home in 7.5 hrs ans took the ribs out, put them on foil, put another coat of seasoning on the, put butter on them and added my rum and coke sauce then wrapped in foil for 1 hr still on low (the temp doesnt change).
After that hr take them out of the pot, drain the juice from the foil into a bowl, put the raw ribs back in the pot and coat with that juice every 15 mins for the next hour then put in the broiler and broil each side with sauce or glaze for 3 minutes
i put a can of cola and onions in the crock pot then put the ribs in with a dry rub.
i've never put butter on it though...what is mop sauce?
mop sauce is pittmaster slang, its basicallly sauce made with drippings from the meat

... best way, IMO.
Especially for beef ribs. I know niccas who swear by the grill for beef and pork, but if you ain't hittin' 'em with that ******* (can't give away my secret) while grillin' and/or put them in a brine solution before you grill 'em, there will still be some level of toughness to them ... especially beef, but even pork, too.
OP's ribs look good tho... seasoning looks green... what'd you use?