For me, HH either in mode SRT or DdRT, with a small DdRT as a second line/lanyard.
It works nicely for the dismantling jobs, as you don't care if there is a limb or not where you want to hang your line.
Very useful too for pruning trees with wide canopies.
Traveling in big trees isn't a so easy task for me, and before that, I used 3 lines to do the job. One long SRT as a central tie-in point, one long Ddrt and one short DdRT to go to the secondary tie-in points and to progress farther along the long reach limbs. It works, but what a mess with 3 ropes to deal with. Some time, just moved 2' and I had to untangle that again !
Now, I hang the main line SRT with the HH at my primary tie-in point. I put my short line at the new tie-in point with my 15' telescopic fishing pole. Then I go there by
shortening the small line. The HH can be glided to lengthen the main line as needed, even if I 'm in the air with very wide angled ropes (often in the same situation, the hitch, even in an usual DdRT, didn't want to move at all). I girch-hitch here one of my rigging slings (I always have 5 on my saddle) and clip in the main line. After loosening the short line, I can reach the new work area by the same mean, farther on the limb, side way or just down of course.
I have to come back by the same points, but it saves me time and energy.
I know that I can unclip the HH's biner and pass the rope over the crotch to make the new tie-in point, but I don't like to drag through it each time all the remaining line.
It remains one point which gives me some headhache in my setup: how to keep the HH in place on the top of the rounded carabiner when there is slack in the line
I have to sort it out to love fully the HH.