Ribbons are indeed standard equipment for brass. Do try that first. It is a good idea as you plan to dampen the back lobe of the figure 8, nothing much interesting is probably happening there. In a good sounding studio, that can add good things though.
Move it a bit away, a meter at least (3 foot) to get the volume down a little. And on very close range the trumpet is sort of noisy (try it and you will see). In addition I would ask the trumpet player to not point the trumpet point blank at the mic, say the mic should see the trumpet 30 degrees off is a good bet. Looking straight into the the bell of the mic the sound is, in my ears, not optimal. From there you can start experimenting where you want to go.