That all sounds perfect Rod. Develop it softly then as you increase volume and duration, be sure the feeling of the BCH (Body’s Concert Hall) is maintained.
I encourage everyone to push their limits but to stay utterly mindful to recognise any choking and overexertion.
The deep psychological messages you are sending yourself are gold!
I saw a horrendous wikihow page taking about how to play high notes on the trumpet. Holy s#*t I got cranky, it is SO destructive having arrows pointing at an animated set of 6 Pack Abs encouraging harder and harder in reference to range.
You are weening yourself away from this approach and developing a healthy understanding of WHAT you should be doing and HOW it shoukd feel.
Stick with it!!!