If you are experiencing head pressure due to active kundalini in DM, my guru has advised an effective technique to dispel the pressure (in addition to Solar Centering, another solid tool). As soon as the pressure builds, I "offload" it to my heart center, offering it as a gift to my ishta. I'll be damned if the pressure doesn't fizzle away like a seltzer tablet, and register like bubbles in my chest. The mantra continues all the while. During particularly active sessions, I may do this three or four times, and this has been tested and repeated over the past six months or so with predictable, positive results.
I'd be interested to hear if others have used their heart center as a diffuser, or if you have similar tools you wish to share with the masses .