I was also similiar to what you are saying. I did try them again and this time did the finishing temp to around 205. Made a world of difference in regards to rendering the the fat. I actually look forward to smoking these. Here is my ranking on ribs and I have smoked all three many times.
1. St. Louis Style
2. Pork
3. Baby Backs
Baby backs seem a lot thicker and just don't seem tender as the other two. I used to wrap ribs, but quit doing it just didn't want to keep adding more ingredient wise to them. I backed off a lot of the seasonings just to get more of the smoked flavor from them. Just my two cents.
I only use dry-rub at least until the end, and kind of an amended 3-2-1.
Smoke 225-250 for 3 hours, wrap in butcher paper about two maybe 3 hours (open and check), finish by opening paper and basting BBQ sauce then cook for 30min to an hour.
THEN close up the paper, cover with towels for at least 30mins, hopefully an hour. They are killer tender. Given enough time on step two, the ribs will fall apart and that's how I like them...but letting them rest at the end is key.