For that weight, with a bone, & that 2X snake I'd have gone a fair bit longer.
The bone slows it down & the snake is a bit light IMO.
I usually go what I call 3-2-1.
bottom =3 briquettes
middle = 2 briquettes
top = 1 briquette (with wood chunks interleaved every 4 the one if I want wood smoke flavor).
Start out the snake with a "head" of 10~12 coals together, just to get the temp up quickly!
That's a 10~12 Hour cook for a 8~9 Lb Pork loin (no bone) at about 180℉ then finish the last 45 min @ 250℉.