You said you were a jumper... Ride it like a rollback.
This is a good suggestion for visualization, as you really need be looking all the way around that turn toward X and the judge. I also like to plan to ride it as half of a 9.5 meter circle instead of half of a 10m circle. If I undershoot by a little, then a teensy step of legyield gets us right where we need to be and actually helps me get my wiggle-worm-gelding truly straight. But if I overshoot, it means I've let my horse blow through my outside aids and then we're SOL.
"Winter's a good time to stay in and cuddle,
but put me in summer and I'll be a... happy snowman!!!"