I'm really surprised they weren't too fatty and chewy not taking to +/- 200 deg. I will give this a shot!
they are rich, thus the constant movement from direct to indirect heat to get to temp.
do NOT serve rare. I am really going to hit the 135/140F on my next cook of these as you need to render the internal fat when cooking.
i also did some pre-trim before the cook and pot-rendered that fat for tallow (always need tallow in the fridge). this will help stop the major flare ups you will see/experience with these short ribs.
the rare pieces were more chewy that I desire. the more medium/med well pieces (end cuts) had perfect texture and deep flavor.
i was researching this cook for the past three weeks. it's definitely different and not what people would expect but the flavor was great. rich, beefy bites with a nice salt and pepper crust.
from my burger making, i love short rib meat in them. my burgers get cooked to 145F and they taste great (50/25/25 chuck/brisket/shortrib).
i think you're in for a treat here. lest we forget, short rib pieces in red Italian gravy (Sunday sauce), simmered for a few hours makes for excellent braised beef. but short ribs grilled are for sure a treat.
and then you can always buy and do these too which are flavor bombs and fun to eat:
https://www.seriouseats.com/grilled-beef-galbi-korean-style-marinated-short-ribs