How do I make Oboe reeds hit high notes smoothly?

Question:

How do I make Oboe reeds hit high notes smoothly?

I'm starting this reedmaking thing, and I've got a few down that work okay, but not great. Which isn't good, because I've got three performances in the next 10 days.
My main problem is on the Albinoni Concerto in D minor. I've got a reed I just finished that sounds beautiful, but it won't make the jump from high A to high D in the last movement. In fact, a problem on most of my reeds is that the high register has poor response. It will play the notes, but only after I tongue them, and I need to slur it in this case. The low register is fine.
What scrape should I do to improve response on the highest register?

Additional Details

5 months ago
What do you mean by thinner? Do you mean to make the opening smaller? Because you can do that by scraping deep windows into the reed. Removing or thinning the spine does that pretty well.

Oh, and P.S.: the reason it wasn't working was because the rental oboe I had got a small crack in the bore on the left hand first-finger key. With a different oboe, it's still difficult to hit that D, but at least it's possible.

Anyways, the question remains: how do you hit high notes smoothly? What scrapes are necessary? And if you previously answered, please explain to me what you mean by "thinner," because that could also refer to reed thickness.

Best Answer - Chosen by Asker: 5 months ago
What do you mean by thinner? Do you mean to make the opening smaller? Because you can do that by scraping deep windows into the reed. Removing or thinning the spine does that pretty well.

Oh, and P.S.: the reason it wasn't working was because the rental oboe I had got a small crack in the bore on the left hand first-finger key. With a different oboe, it's still difficult to hit that D, but at least it's possible.

Anyways, the question remains: how do you hit high notes smoothly? What scrapes are necessary? And if you previously answered, please explain to me what you mean by "thinner," because that could also refer to reed thickness.