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One thing you can try before firing the money gun is re-bedding the pads in. If the pads or discs have glazed a bit, it can really help with getting the pads re-acquainted with the discs.
Rather than writing it all out, follow this guide:
https://www.zeckhausen.com/catalog/index.php?cPath=6446_6443
I've been using this same guide for 20 years (they update the pic but the text is the same).
It's definitely a money gun problem, eh? Funnily enough my BBSs are in the air and on the way to me, they will need tyres this time next week! 💸
You and @mcmyk have nailed it, refreshed rotors, pads and lines is probably the answer and will hopefully fix everything. If that doesn't work then I obvs need huuuuuge Brembos (and bigger rims to accommodate them) so I can take the dog to his favourite walkies spot safely and in the utmost comfort.