Once you have become accustomed to "massive" tonguing, your breathing usually is messed up too. Tonguing hard gives a pressure burst that kick start the lips. To get out of that habit and keep it from ever coming back, I recommend modifying your daily routine. Practice inhaling and exhaling. Make sure when you go from one to the other that you do not hold the air in. After you have done this a couple of times replace exhale with play - NO TONGUING, JUST EXHALE INTO THE HORN. Which tone you play is not significant at this stage. The important part is to be able to play long tones without the tongue whatsoever! You should be able to play your entire range from high to low this way. If not, work on it until you can - NO TONGUING!!!!!!!!!!!!!! Practice slurs the same way - NO TONGUING, just inhale and exhale! After a week or two of this, you can TRY to add the tongue with a light TOOH EXACTLY at the same point when you change from in to exhale. Plan 4 weeks of practice on this! If your air is flowing well, you will not tongue harder than necessary! I will say to forget any alternative articulations. A trumpet player needs a light positive attack at the beginning not some compensated or castrated form. We solve the problem not compensate causing TWO problems!! The longtones and slurs without the tongue should stay in the daily routine for the rest of tyour life!