high notes ... is it a discovery?

I have been having trouble for a very long time with my higher notes, starting in particular with the G, the G that sits on the second line up of the treble clef, the one right there at the swell of the round part of the treble sign. I have worked and worked and worked on it. I work on my high notes every day in my warm up, playing octaves that start at low C to middle C, on up. When I get to G, the octave up is very hard in 4th position; I can get it more easily in 2nd, but it still is a thin note. I am almost driven to distraction because although it is getting better, and I can play the A, B flat, B, and C above it, I am just having a dreadful time with this note.

Well. Tonight, in my warmup, I just did something a little different and I am almost scared by how much better my high notes came - scared because my question is, "Was that an anomaly that will never happen again?"

I kind of pushed more of my lower lip in the mouthpiece and the result was that the high notes came out sounding entirely differently, not necessarily fuller and rounder, but different. Try though I may to not do it, my tendency has been to get the higher notes with my upper lip, but whatever I was doing today had them coming right out through both lips ... and they were almost effortless! And now I want to try it more, but it is too late to practice, and then I will be up in Anchorage tromboneless for the next three days!

I might have gone this route today because in my last lesson, Jack was talking about how to get pedal notes and the relative position of one lip versus the other. I don't know, I just tried it and something worked.