JM after some thought, it still looks great. I had a brush that I cut the bristle length down by 1" every other tuft to try to reduce the stiffness but increase the scrubbing power, Its the ends of the brush that wear by going into the corners and frames, and to state the obvious JM if a composite bristle pattern could be made so that a slightly harder wearing bristle was on the ends, but as I suggested maybe its a different topic.
I lightened one of Gazs brushes to 7.9ozs so would guess that your brush will weigh about 6.5oz without the jets, assuming that you have also thinned the back down.
They used to make really light brushes in the 60s I have seen a car janitors brush that looked like a trad brush but was very light, probably gone into history by now as after years of searching havent found my holy grail "foam head" brush
