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I am only covering brake with index finger. I don't understand why the rest of my hand is achy - little fingers in particular - it's not like they're providing the most grip. Even on straight bits I was taking every opportunity to put my hands on top (ie. with zero grip force) to make sure I wasn't death gripping. I might ditch the SID grips and get something bigger squishier to see if that makes any difference.
hippy-
My little fingers ache when I put my hands too wide on the bars and they overhang the ends. The fingers might not be doing much but I guess you brace on the grips with the outside bit of your palm rather than the middle and then I get roughly around my outside knuckles.
Are they 800mm bars? I'd consider moving the levers further in again.
frankenbike
Only cove brake with index finger. Too much pressure on ulnar nerve.
Outside foot needs to be in pedal and pedal is close to floor, you use your weight through that pedal to lower the centre of gravity, weight through inside of foot, so big toe leaning into pedal axle. Lean the bike not you, use the edge of the tire. Look where you want to go not the track infront.