It's only a matter of how you set them up.Haven’t been entirely satisfied with the braking performance of XTR cantis (maybe I didn’t set them up correctly either) so decided the following change:
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As you can see for these pictures the angles these Ritchey / Dia Comp cantis have is bigger. This should increase the leverage of these cantis when pressing the rim.
Also the mounting of the breaking pads are on the back side of the cantilevers not on the front like Shimano ones. This brings the braking power closer to the fork and frame studs / pivots and should result in slightly less flex.
Still a stiffener will be needed at least on the rear brake..
This is it. Btw lower the straddle on the rear cause its too high. Braking will feel so much better you will forget seatstay flex.It looks like the XTR would have more leverage than the Ritchey Logic. Leverage would be measured in a straight line from the pivot point to where the cable is clamped/nipple is held.
You have a fixed straddle cable that makes tweaking the set-up of cantilevers limiting. If you had a traditional hanger with separate straddle cable you could drop the hanger very low to the tyre (without rubbing) to maximise leverage as you are pulling the brake arms more into the rim vs. if the the straddle cable is a lot higher as a lot of the pulling force is going upwards rather than sideways (into the rim).
If you pushed your pads inwards (you'd need to change to a separate straddle/hanger) you'd probably end up with a nicer angle to maximise leverage.
You can then also test/see how the feel of the brake changes at the lever from high position/low position on the cable hanger. High has less leverage so will feel firmer (less flex at the studs) and lower will feel sponger (more flex at the studs).
One thing to watch out for will be heel clearance on the rear brakes if they stick out too much!
Happy tinkering!