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I've got a very small basket (deliberately) so am only running something like 13g doses. Really suspect that increasing the pressure will just increase my problems, but I'll keep it in the back pocket in case buying a blind shaker, shimming my grinder, getting a levelling tamper, walking into the ocean, etc don't solve it.
Fwiw (and I know this misses the crux of your post), I found 6 bar awful on mine, went back to 9 after a month of trying and started pulling lovely shots straight away again.