Crusadead

Hey guys, I've been playing trumpet for 4 years, and have been taking lessons from a professional big band trumpet player for 1 year. Ever since I have started playing trumpet, I can never seem to not get a red ring around my lips. I've asked my teacher about this, and she said to use less pressure. As simple as it sounds, I cannot get a full sound I usually get without using a little bit of pressure, and with a little bit of pressure I still get a red ring. I'm so worried about this red ring because my trumpet teacher told me that I wouldn't be able to play very long in one session with it, and I wouldn't allow my embrochure to grow very well. The other day I played for two hours straight with a red ring, and I still could play well, but I lost 3-4 notes in my range. Does this mean my red ring is normal or should I use some sort of technique not to get the red ring? Also, my teacher makes me do the Chicowicz flow exercises. I can make it up to the high G, but after that, I can't seem to go higher. Using faster air is essential my teacher says, and to do this I have to move my tongue up by saying E. But while doing the chicowicz exercises, it feels like my tongue is as heavy as a hunk of gold, so I can't move it up. What should I do about this?