I also use a G29, and I think braking has always been my weak point. Very hard to modulate with the G29 pedals. Push too hard and your brake distances go long, but like the throttle, the actuall usable range is small. I've gotten better, and found that lighter pressure gives shorter distances, but still have no feel. Makes for inconsistancy. At Fuji I would brake at the same point in Q, so no dirty air, and if I hit em hard at first, I would go long. If I was light on the pedal, sometimes it would be perfect into T1, sometimes I would go long because I was too light at first, and sometimes I would have to release the brakes because I dropped too much speed and was short of the corner. With better feel, I'd always brake late enough for the last to work, but I can't count on my braking distance to always be that short.
My wheel is also showing it's age. It's always had a "dead spot" on center, which is mostly in the force feedback, and only slightly in the actual steering of the car. That is up to about 20 degrees of rotation now. Makes it hard to control, especially when correcting small slides. It's like driving a car with shot tie rod ends. I would love to try out a high end wheel and pedals setup to see how I do.