Holy Smokes! Yeah BABY, those look BEAUTIFUL!!!
Good pull-back (indicates degree of meat shrinkage/doneness), last pic (clicked to enlarge) has excellent smoke reaction (smoke ring), and looks to have some decent moisture, as well. Too much color? Nope, that's a thing of absolute perfection right there!
That lower chamber temp you were battling is mostly responsible for that deep smoke ring. Beef gets a darker but shallower smoke ring than pork or poultry, but getting it that deep in beef requires nearly prime conditions. It does surprise me to see it that well developed even in a charcoal-fired smoker, especially without a water pan, but thinking back on a couple smokes where I had low-temp issues, the smoke ring was pretty awesome like what you got here. I play with lower starting temps sometimes just for kicking the smoke ring into overdrive sometimes, but I don't recommend anyone do it on purpose, due to possible food safety issues. The low-humidity smoke chamber in this was a rib-saver...had you been using a way to jack-up the humidity with added water evaporation in the smoke chamber, the ribs could have dried-out a lot over the longer cooking time, so keep that in mind. From what I see here, you had all the elements to keep things going in your favor, even though somewhat low chamber temps of ~200* were an issue.
Nicely done! Even when the chips seem to be down, the situation is seldom as bad as it seems...there's usually a way to come out of it smiling in the end.
Eric