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The rotors weren't changed in the service, and the pads were disintegrating! I can’t at all remember what they were, I think two people’s names, not a brand I’d heard of.
I think you can get the right adaptors (hopefully for less £ than that is I go that route) and that site is the first I’ve found that suggests I’m not entirely crazy
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The rotors weren't changed in the service.
In our workshop we usually recommend both to be changed, even if the rotor have minimal wear, it can greatly affect the braking performance.
Different rotor like Magura tend to offer more power due to the difference in steel.
Sound like your brakes is one of those Shimano one that’s pretty hard to get it to feel nice and sharp, a new hydraulic hosing help improve it but there’s only so much we can do
Bear in mind that I'm 90+ kg but I'm also riding around with a loaded bike (touring, racing, etc) so system weight is more likely well over 100kg.
Were the brakes you used actually bedded in? Disc brakes don't work if the rotors are fresh, they need some hard stops to work properly.
I'd check the frame and fork can actually take bigger rotors before thinking that will solve things. Are there actually adapters for flat mount that will do bigger than 160mm?