A week isn't all that long. Start using those kanji in context during your Japanese studies, as opposed to straight-up English keywords -> kanji, and you may find that the act of writing out many different kanji will not only increase your vocabulary but help solidify those kanji in your mind.
For example:
図書館 ・ としょかん "library"
学校 ・ がっこう "school"
日本語 ・ にほんご "Japanese language"
英語 ・ えいご "English language"
学生 ・ がくせい "student"
先生 ・ せんせい "teacher"
食べ物 ・ たべもの "food"
面白い ・ おもしろい "interesting"
仕事 ・ しごと "job"
手伝い ・ てつだい "to provide help"
Are all very basic, common compounds you will come across in most text books, anki-decks, etc. over and over again, and if you are writing as a part of your study, you will essentially be "reviewing" many different kanji, over and over, though instead of mapping them to English keywords, you will begin to re-map them in your brain to Japanese readings and vocabulary.
So... in saying, the more you focus on Japanese and less of English keywords for kanji, those kanji will become intimate with your memory and recognition without you being aware of it at the time.
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pro-tip:
if you've got kanji in box 6, forget about RTK and start learning japanese.
I just logged in again for kicks for the first time in several years. I have 2671 cards due, and over 300 restudy cards. I can't believe I even bothered getting 700 of them into the 6th box.
Moral to the story: go learn some real japanese now.
Edited: 2012-12-19, 2:41 am
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By doing core vocab or ya just reading, those kanji will solidify in your head more
permanently.
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UPDATE: I just wanted to say Thank You for your advice. I started using a "Pre-Intermediate Japanese Reader" book and also signed up for the NHK News Easy challenge through this site (which, as it turns out, is anything but "easy" for my current level!). But in just these two weeks since my OP, I've noticed a definite improvement because of seeing kanji in context, and am now back to averaging 84-89% correct in my reviews. I'm really enjoying kanji recognition in the things I'm reading.
Thanks so much for your support, uisukii, nadiatims, and dtcamero - and Happy New Year, everyone!
幸多き新年をお迎えください。
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This also happens to me, I'm at 1650 and I find myself failing super basic kanji that I can't recall the story or some element, but when I see them I'm like "how can I not remember this, so easy".
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Newbie question here, but what do you mean by sixth box?