Pfansteihl dealers often print very optimistic tracking force numbers, I doubt that stylus will track properly when set that low (notice that they don’t have a tracking force printed on the back of the package either). You are probably going to have to almost double that tracking force, probably around 2.5 gams is where the sibilance will ease up. Personally I’ve never had satisfactory results from any Phansteihl replacements for Pickering / Stanton carts so I only use them on heavy trackers like old record changers.