Single-note tongue blocking thing? Am I shooting myself in the foot

I’m pretty deep into the single note module, and I kind of accidentally started doing this thing to isolate notes where I use my tongue and kind of make a “u” out of it to block out the notes on the sides. It actually works pretty well on all notes except that dang 2 draw. I am still working on the lip blocking and that works about 50% of the time, so I will keep working on it.

My question is…am I shooting myself in the foot by doing a bad technique while I’m learning…or is this a valid way to play single notes? Thanks so much!