Was it a new hose or old hose?
You put in blue devil, there was white smoke coming out of back when started. This does not sound good, maybe Im just a worrier.
The problem i am seeing is the thing ran fine, then hose blew, and you put in blue devil to seal block. Block is now sealed (hopefully), and it seems there is air getting into the system.
My question is, why did the hose blow in the first place? Was it just old, or did a major catastrophy happen in the engine?