If you're on a 29er, 200/203 rotors up front are mandatory as far as I'm concerned. That said, I have a hard time believing that Code RSCs don't give you enough stop even with a 180 rotor. Sounds like something might be fucky? If you've bled them multiple times IDK what it would be though. Contaminated pads and/or rotors? Four piston Shimanos are gonna be *a bit* more powerful than the Codes but the two pistons definitely won't. Are you sure you have Code RSCs? The Rs don't have the 'swing link' so they're not as powerful.
I'd try a 200/203 rotor up front. I like the Sram tri-align style adaptor way better than the shimano one. It's a lot easier to get good alignment. Sram's big boy rotors are 200 though so if you wanna use a 203 rotor of your choice, you'll just need 1mm washers as spacers. That's the setup I run with a TRP slotted rotor, pretty nice.
If your brakes are really RSCs and you want to ditch them I might take them off your hands.
Also, I've got a bunch of Sram clamps and matchmakers in the bin if you need those.
There's nothing better than sliding down snow, and flying through the air
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