I am into my 5th year as a comeback player. The first three years were a struggle, and most of the struggle was embouchure related, although I didn't realize that until approximately 2+ years ago.
I always liked to watch videos of Chris Martin, Principal Trumpet with the New York Philharmonic Orchestra. I loved how he sounded and how he seemed to make playing the trumpet look so easy. Amongst the videos of Chris I came upon one of him being interviewed on Sarah's Horn Hangouts. Near the end of the interview he discussed the poo attack. I was intrigued by what he was saying and watched him demonstrate it. That was the beginning of me and the poo attack .
Although I don't recall having any problems when I played in the 50s and 60s, since my comeback my attack, and articulation in general, had always been inconsistent, and mostly on the messy side. Well that all changed after I mastered the poo attack and I haven't looked back since.
I know everyone is different. What works for one person won't necessarily work for another. So I am not advocating a change to anyone, but if you are interested in the poo attack you can do a Google search of Sarah's Horn Hangouts videos and you'll find the one I came across of her interviewing Chris. I believe the part where he discusses the poo attack is somewhere near the last 10 minutes. But the entire interview is really interesting.