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hippy
That seems like a massive dose. Is there any chance you're over-filling and when you put the portafilter in and rotate, the puck is rubbing against the shower screen?
Yep, I normally aim for around 26-28 as a starting point then go from there using taste
Likely won't make much difference as the water will be exerting more pressure anyway. Any chance the tamping isn't level so you're getting channelling down the side? Or are you knocking the portafilter with the tamper to get grounds of the side? That can also cause channelling by cracking the puck.