The Pickering V15 and Stanton 600 are totally different cartridges.I'm not sure the Stan 600 and Pickering V15 got the same mounting "ear" formation nor that it's sloped face is identical, so maybe that oversized broom isn't angled at it's ideal position. You could try to shim the Stan and give it a few more fractions of an inch clearance from the headshell.
The cart was actually designed for use with the brush. The brush is there to aid tracking so basically the amazing separation numbers were only possible WITH the brush. The brush works a bit like oil damping keeping the stylus lined up in the groove. The original soft brush was silent in use and only a positive. Jico brushes are too hard, the only decent new brushes I have found are Pfanstiehl ones. Probably though more an issue with 681 and 881 and Pickering variants.Remove the brush and reduce tracking force a gram or so, I've found those brushes annoying even when they're not impeded by a headshell. .

Not true tracking is in the instruction I can find and post..Regardless, they are intended for easy removal and I've done so with a V15 ATE also mounted on an Elac 50H. The brush interfered so off it came. I've owned a Stanton 681EE for over 45 years and except for the first couple, have taken brushes off any styli I've gotten for it. That was common "back in the day".
There were instructions from Stanton re tracking force needed for brush on or brush off. No mention was made whatsoever about aiding trackability of the cartridge. It was strictly a dust/debris removal devide. As a matter of fact, Pickering promoted their brush feature coining the term "Dust-O-Matic".
Later iterations of Shure V15's were a different matter being as those brushes were dampened but again, instructions from Shure included tracking forces for brush up or brush down.
Not the greatest picture, dark area of the room so flash was automatic.
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It will make a difference and this is proven it is why we have oil damping in arms which does similar, but the brush does it better. This is not an arguable point it is proven the brush helps the stylus track the groove, this was worked out decades ago, the only reason more companies did not use it was copyright, but Shure managed to do something similar spring loaded maybe that is how they got round it.Stanton's hype notwithstanding, the brush's actual audible effect is nada. If you want to remove it, do so. Won't make a difference.
That said, it's ok if the brush protrudes from the headshell, and there is nothing wrong with how the stylus looks in the original picture.
To the OP. You've tried it both ways. Have your ears tell you what's right and do that.